| Beta (ฺB - Ray) | รังสีเบตา, Example: มีกำลังแรงกว่ารังสี alpha สามารถไชเข้าไปในผิวหนังได้ลึกถึง 2 ซม. เป็นอันตรายเมื่อฝังอยู่ ณ ที่ใด ก็จะทำลายเนื้อเยื่อบริเวณนั้น เช่น 1101 I อาจสะสมที่ต่อมไทรอยด์ได้เช่นเดียวกับ iodine ที่ไม่เป็นกัมมันตรังสี สามารถชักนำให้เกิดมะเร็งได้ สิ่งที่จะกั้นรังสีbata ได้คือ แผ่นพลาสติก กระจก อะลูมิเนียม แต่พลาสติกและกระจกจะค่อยๆ เปราะ เมื่อถูกรังสีที่เข้มข้นมาก [สิ่งแวดล้อม] |
| Beta Blockers | ยาต้านเบต้า [การแพทย์] |
| Beta Carboxyl Group | หมู่เบต้าคารบอคซิล [การแพทย์] |
| Beta Carotene | เบตาคาโรทีน, เบต้าแคโรทีน [การแพทย์] |
| Beta Cells | เบตาเซลล์, เบตาเซลล์ [การแพทย์] |
| Beta Cyanin | บีตาไซยานิน [การแพทย์] |
| Beta Cyanoalanine | เบต้าไซยาโนอะลานีน [การแพทย์] |
| Beta Globulins | บีตาโกลบูลิน, สาร;เบตาโกลบุลิน;เบต้า-กลอบบูลิน [การแพทย์] |
| Beta Hemolytic Streptococci | เชื้อในแผลไฟไหม้น้ำร้อนลวกชนิดกรัมบวก [การแพทย์] |
| Beta Keratin | เบต้าเคอราติน [การแพทย์] |
| beta | (n) the 2nd letter of the Greek alphabet |
| beta | (n) beets, Syn. genus Beta |
| beta | (adj) second in order of importance, Example: the candidate, considered a beta male, was perceived to be unable to lead his party to victory |
| beta | (adj) preliminary or testing stage of a software or hardware product, Example: a beta version; beta software |
| beta blocker | (n) any of various drugs used in treating hypertension or arrhythmia; decreases force and rate of heart contractions by blocking beta-adrenergic receptors of the autonomic nervous system, Syn. beta-adrenergic blocking agent, beta-adrenergic blocker, beta-blocking agent |
| beta blocker eyedrop | (n) a treatment for glaucoma; the eyedrops reduce intraocular pressure by reducing the production of aqueous humor |
| beta-carotene | (n) an isomer of carotene that is found in dark green and dark yellow fruits and vegetables |
| beta cell | (n) a cell that produces insulin in the isles of Langerhans in the pancreas |
| beta centauri | (n) the second brightest star in Centaurus |
| beta crucis | (n) the second brightest star in the Southern Cross |
| Beta | n. [ Gr. bh^ta. ] The second letter of the Greek alphabet, B, β. See B, and cf. etymology of Alphabet. Beta (B, β) is used variously for classifying, as: (a) (Astron.) To designate some bright star, usually the second brightest, of a constellation, as, β Aurigæ. (b) (Chem.) To distinguish one of two or more isomers; also, to indicate the position of substituting atoms or groups in certain compounds; as, β-naphthol. With acids, it commonly indicates that the substituent is in union with the carbon atom next to that to which the carboxyl group is attached. [ Webster 1913 Suppl. ] |
| Betacismus | { ‖, n. Excessive or extended use of the b sound in speech, due to conversion of other sounds into it, as through inability to distinguish them from b, or because of difficulty in pronouncing them. [ Webster 1913 Suppl. ] Variants: Betacism |
| Betaine | n. [ From beta, generic name of the beet. ] (Chem.) A nitrogenous base, C5H11NO2, produced artificially, and also occurring naturally in beet-root molasses and its residues, from which it is extracted as a white crystalline substance; -- called also lycine and oxyneurine. It has a sweetish taste. [ 1913 Webster ] |
| Betake | v. t. [ imp. Betook p. p. Betaken p. pr. & vb. n. Betaking. ] [ Pref. be- + take. ] 1. To take or seize. [ Obs. ] Spenser. [ 1913 Webster ] 2. To have recourse to; to apply; to resort; to go; -- with a reflexive pronoun. [ 1913 Webster ] They betook themselves to treaty and submission. Burke. [ 1913 Webster ] The rest, in imitation, to like arms
Betook them. Milton. [ 1913 Webster ] Whither shall I betake me, where subsist? Milton. [ 1913 Webster ] 3. To commend or intrust to; to commit to. [ Obs. ] [ 1913 Webster ] |
| Beta rays | (Physics) a form of ionizing radiation emitted by radioactive substances (such as radium), more penetrating than alpha rays, and consisting of negatively charged electrons. The electrons are the same kind of particle as those of cathode rays, but have much higher velocities (about 35, 000 to 180, 000 miles per second). They are readily deflected by a magnetic or electric field. [ Webster 1913 Suppl. ] |
| betatron | 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 ] |
| Betaught | pos>a. [ p. p. of OE. bitechen, AS. bet&aemacr_;can, to assign, deliver. See Teach. ] Delivered; committed in trust. [ Obs. ] [ 1913 Webster ] |
