%tron%

n. The antiparticle of a neutron. It has the same mass as a neutron, but a spin and magnetic moment opposite that of the neutron. [ WordNet 1.5 ]

‖n. [ Gr. &unr_; from + &unr_; star. ] (Astron.) That point in the orbit of a double star where the smaller star is farthest from its primary. [ 1913 Webster ]

adj. a person trained to travel in a spacecraft; one who travels in a spacecraft; -- called in the Soviet Union and Russia cosmonaut.
Syn. -- spaceman, cosmonaut [ WordNet 1.5 ]

adj. of or pertaining to astronautics.
Syn. -- astronautical [ WordNet 1.5 ]

adj. of or pertaining to astronautics.
Syn. -- astronautic [ WordNet 1.5 ]

n. The theory and practice of navigation through the upper atmosphere or outer space; the science of travel beyond the Earth's atmosphere. [ WordNet 1.5 +PJC ]

n. 1. navigating according to the positions of the stars.
Syn. -- celestial navigation [ WordNet 1.5 ]

n. [ See Astronomy. ] 1. An astrologer. [ Obs. ] Shak. [ 1913 Webster ]

2. One who is versed in astronomy; one who has a knowledge of the laws of the heavenly orbs, or the principles by which their motions are regulated, with their various phenomena. [ 1913 Webster ]

An undevout astronomer is mad. Young. [ 1913 Webster ]

n. [ OE. & OF. astronomien. See Astronomy. ] An astrologer. [ Obs. ] [ 1913 Webster ]

a. Astronomical. [ 1913 Webster ]

a. [ L. astronomicus, Gr. 'astronomiko`s: cf. F. astronomique. ] Of or pertaining to astronomy; in accordance with the methods or principles of astronomy. -- As`tro*nom"ic*al*ly, adv. [1913 Webster]

Astronomical clock. See under Clock. --
Astronomical day. See under Day. --
Astronomical fractions,
Astronomical numbers. See under Sexagesimal. [1913 Webster]

v. i. [ Gr. &unr_;. ] To study or to talk astronomy. [ R. ] [ 1913 Webster ]

They astronomized in caves. Sir T. Browne. [ 1913 Webster ]

n. [ OE. astronomie, F. astronomie, L. astronomia, fr. Gr. &unr_;, fr. &unr_; astronomer; 'asth`r star + &unr_; to distribute, regulate. See Star, and Nomad. ] 1. Astrology. [ Obs. ] [ 1913 Webster ]

Not from the stars do I my judgment pluck;
And yet methinks I have astronomy. Shak. [ 1913 Webster ]

2. The science which treats of the celestial bodies, of their magnitudes, motions, distances, periods of revolution, eclipses, constitution, physical condition, and of the causes of their various phenomena. [ 1913 Webster ]

3. A treatise on, or text-book of, the science. [ 1913 Webster ]

Physical astronomy. See under Physical. [ 1913 Webster ]

n. 1. the area comprising the islands of central and S Pacific (Indonesia and Melanesia and Micronesia and Polynesia). [ WordNet 1.5 ]

adj. 1. of or pertaining to Austronesia. [ WordNet 1.5 ]

n. a type of particle accelerator which accelerates a continuous beam of electrons to high speeds by means of the electric field produced by changing magnetic flux.
Syn. -- induction accelerator. [ WordNet 1.5 ]

n. a particle accelerator which is capable of accelerating protons up to 6 gigaeletron volts. [ WordNet 1.5 ]

{ } n. [ Gr. &unr_; mirror, fr. &unr_; visible. ] A reflecting optical glass or instrument; a mirror. [ Obs. ] [ 1913 Webster ]

n. [ Obs. ] See Catopter. [ 1913 Webster ]

n. [ F. citron, LL. citro, fr. L. citrus citron tree (cf. citreum, sc. malum, a citron), from Gr. ki`tron citron ] 1. (Bot) A fruit resembling a lemon, but larger, and pleasantly aromatic; it is produced by the citron tree (Citrus medica). The thick rind, when candied, is the citron of commerce. The fruit was once called the lime. [ 1913 Webster ]

2. A citron tree, Citrus medica. [ 1913 Webster ]

3. A citron melon. [ 1913 Webster ]

Citron melon. (a) A small variety of muskmelon with sugary greenish flesh. (b) A small variety of watermelon, whose solid white flesh is used in making sweetmeats and preserves. --
Citron tree (Bot.), the tree which bears citrons. It was probably a native of northern India, and is now understood to be the typical form of Citrus Medica. [ 1913 Webster ]

n. a cross between Citrus sinensis and Poncirus trifoliata.
Syn. -- genus Citroncirus. [ WordNet 1.5 ]

n. 1. wood of a citron tree. [ WordNet 1.5 ]

2. a durable fragrant wood used in building (as in the roof of Cordova Cathedral); -- called also sandarac.
Syn. -- sandarac. [ WordNet 1.5 ]

n. See Electron. [ Webster 1913 Suppl. ]

n. a particle accelerator that imparts energies of several million electron-volts to rapidly moving particles; it is used in investigations in nuclear physics and particle physics. [ WordNet 1.5 +PJC ]

a. (Chem.) Pertaining to, or derived from, dextrose; as, dextronic acid. [ 1913 Webster ]

Dextronic acid, a sirupy substance obtained by the partial oxidation of various carbohydrates, as dextrose, etc. [ 1913 Webster ]

n. [ NL., fr. Gr. 'h`lektron. See Electric. ] 1. Amber; also, the alloy of gold and silver, called electrum. [ archaic ] [ 1913 Webster ]

2. (Physics & Chem.) one of the fundamental subatomic particles, having a negative charge and about one thousandth the mass of a hydrogen atom. The electron carries (or is) a natural unit of negative electricity, equal to 3.4 x 10-10 electrostatic units, and is classed by physicists as a lepton. Its mass is practically constant at the lesser speeds, but increases due to relativistic effects as the velocity approaches that of light. Electrons are all of one kind, so far as is known. Thus far, no structure has been detected within an electron, and it is probably one of the ultimate composite constituents of all matter. An atom or group of atoms from which an electron has been detached has a positive charge and is called a cation. Electrons are projected from the cathode of vacuum tubes (including television picture tubes) as cathode rays and from radioactive substances as the beta rays. Previously also referred to as corpuscle, an obsolete term. The motion of electrons through metallic conductors is observed as an electric current. A particle identical to the electron in mass and most other respects, but having a positive instead of a negative charge, is called a positron, or antielectron [ Webster 1913 Suppl. +PJC ]

a. (Chem. & Physics) 1. Having the property of being attracted by an electro-positive body, or a tendency to pass to the positive pole in electrolysis, by the law that opposite electricities attract each other. Contrasted with neutral and electropositive [ 1913 Webster ]

2. Negative; nonmetallic; acidic; -- opposed to positive, metallic, or basic. [ 1913 Webster ]

3. (Physics) carrying a negative electrical charge. [ PJC ]

4. (Chem. and Physics) having a tendency to take up electrons and form negative ions; having a relatively positive electrode potential. [ WordNet 1.5 +PJC ]

adj. (Physics) having no net electric charge; not electrified; uncharged; neutral. Opposite of charged. [ WordNet 1.5 ]

a. (Physics & Chem.) 1. Of or pertaining to an electron or electrons; as, electronic energy. [ wns=2 ] [ Webster 1913 Suppl. ]

2. Using the methods or principles of electronics as part of the working mechanism; -- of devices; as, electronic circuit; electronic devices; electronic entertainment devices. [ PJC ]

3. Using computerized storage or transmission of information; as, electronic banking; electronic mail; electronic fund transfer. [ PJC ]

4. of or pertaining to electronics. [ wns=1 ] [ WordNet 1.5 ]

n. a device depending on the principles of electronics and using the manipulation of electron flow for its operation. [ PJC ]

☞ Numerous electronic devices are in daily use, among them the television, radio, computer, robot, transmitter, receiver, VCR, CD player, etc. [ PJC ]

n. (Computers) 1. a message transmitted from one computer to another, accessible by means of a mail reading program on the receiving computer. The message may have one or many intended recipients, and may be directed by the sending program to one or to multiple receiving computers. The message is typically in the form of a computer file, and may be a simple ASCII text, or any other type of binary coded information
Syn. -- email. [ PJC ]

n. 1. the branch of physics that deals with the behavior of electrons. Electronics is primarily concerned with phenomena other than simple conduction, such as emission of electrons, storage of electrical charge, the effects of electrical fields on the conduction of electrons through a circuit, and amplification and manipulation of electric signals such as voltage or current by design of circuits. Electronics also encompasses the application of such fundamental principles to the construction of devices using the manipulation of electrons in their operation, known as electronic devices. [ PJC ]

2. the branch of engineering concerned with design of devices using the principles of electronics, for practical purposes. [ PJC ]

3. electronic devices generally, or the electronic circuits within an electronic device. The Russian harvesters are sturdily constructed, but their electronics are primitive. [ PJC ]

n. a unit of energy, being equal to the kinetic energy acquired by an electron when accelerated through a potential difference of one volt. It is equal to 1.602 x 10-19 Joules. It is abbreviated eV. The unit electron-volt is often used to express the rest mass and the energy of fundamental particles, especially when accelerated to high velocity in an accelerator. In accelerators, the units encountered are more commonly megaelectron-volts (MeV or million electron-volts) and giga-electron-volts (GeV or billion electron-volts). [ PJC ]

/mhw> n.; pl. Elytra [ NL., fr. Gr. 'e`lytron, fr. 'ely`ein to roll round. ] (Zoöl.) (a) One of the anterior pair of wings in the Coleoptera and some other insects, when they are thick and serve only as a protection for the posterior pair. See Coleoptera. (b) One of the shieldlike dorsal scales of certain annelids. See Chætopoda. [ 1913 Webster ]

v. t. To act the part of a patron towards; to patronize. [ Obs. ] Shak. [ 1913 Webster ]

n.; pl. Entoplastra [ Ento- + plastron. ] (Anat.) The median plate of the plastron of turtles; -- called also entosternum. [ 1913 Webster ]

n.; pl. Epiplastra [ Pref. epi- + plastron. ] (Anat.) One of the first pair of lateral plates in the plastron of turtles. [ 1913 Webster ]

n. [ NL. See Hexameter. ] An hexameter. [ Obs. ] Chaucer. [ 1913 Webster ]

{ } n. [ F. gastronome, fr. Gr. &unr_;, &unr_;, stomach + &unr_; law, &unr_; to distribute. ] One fond of good living; an epicure. Sir W. Scott.

/mhw>, a. [ Cf. F. gastronomique. ] Pertaining to gastromony. [ 1913 Webster ]

n. A gastromomer. [ 1913 Webster ]

n. [ Gr. &unr_;: cf. F. gastronomie. ] The art or science of good eating; epicurism; the art of good cheer. [ 1913 Webster ]

a. 1. Not easily restrained; ungovernable; obstinate; stubborn. [ 1913 Webster ]

Now let the headstrong boy my will control. Dryden. [ 1913 Webster ]

2. Directed by ungovernable will, or proceeding from obstinacy; as, a headstrong course. Dryden.

Syn. -- Violent; obstinate; ungovernable; untractable; stubborn; unruly; venturesome; heady. [ 1913 Webster ]

n. Obstinacy. [ R. ] Gayton. [ 1913 Webster ]

{ ‖‖ }, n.; pl. Hemelytra [ NL. See Hemi, and Elytron. ] (Zool.) One of the partially thickened anterior wings of certain insects, as of many Hemiptera, the earwigs, etc. [ 1913 Webster ]

n. [ Hyo- + plastron. ] (Zool.) The second lateral plate in the plastron of turtles; -- called also hyosternum. [ 1913 Webster ]

n.; pl. Hypoplastra [ Pref. hypo- + plastron. ] (Anat.) The third lateral plate in the plastron of turtles; -- called also hyposternum. [ 1913 Webster ]

n. Absolute seignory or possession; the act of investing with such possession. [ R. ] Cotgrave. [ 1913 Webster ]