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a. [ Gr. 'achrw`matos colorless; 'a priv. + chrw^ma, chrw`matos, color: cf. F. achromatique. ] 1. (Opt.) Free from color; transmitting light without decomposing it into its primary colors. [ 1913 Webster ]

2. (Biol.) Uncolored; not absorbing color from a fluid; -- said of tissue. [ 1913 Webster ]

Achromatic lens (Opt.), a lens composed usually of two separate lenses, a convex and concave, of substances having different refractive and dispersive powers, as crown and flint glass, with the curvatures so adjusted that the chromatic aberration produced by the one is corrected by other, and light emerges from the compound lens undecomposed. --
Achromatic prism. See Prism. --
Achromatic telescope, or
microscope, one in which the chromatic aberration is corrected, usually by means of a compound or achromatic object glass, and which gives images free from extraneous color. [ 1913 Webster ]

adv. In an achromatic manner. [ 1913 Webster ]

n. Achromatism. [ 1913 Webster ]

n. (Biol.) Tissue which is not stained by fluid dyes. W. Flemming. [ 1913 Webster ]

adj. 1. not readily colored by stains; -- of substance of a cell nucleus chromatinic [ WordNet 1.5 ]

v. 1. remove color from.
Syn. -- achromatize, make achromatic [ WordNet 1.5 ]

n. [ Cf. F. achromatisme. ] The state or quality of being achromatic; as, the achromatism of a lens; achromaticity. Nichol. [ 1913 Webster ]

n. [ Cf. F. achromatisation. ] The act or process of achromatizing. [ 1913 Webster ]

v. t. [ imp. & p. p. Achromatized p. pr. & vb. n. Achromatizing ] [ Gr. 'a priv. + &unr_; color. ] To deprive of color; to make achromatic. [ Also spelled achromatise. ] [ 1913 Webster ]

n. [ Gr. 'a priv. + &unr_; color + &unr_; sight. ] Color blindness; inability to distinguish colors; Daltonism. [ 1913 Webster ]

a. [ See Ahromatic. ] Lacking, or deficient in, color; as, achromatous blood. [ Webster 1913 Suppl. ]

a. [ Gr. &unr_; colorless; &unr_; priv. + &unr_; color. ] Free from color; colorless; as, in (Physiol. Chem.), the achromic point of a starch solution acted upon by an amylolytic enzyme is the point at which it fails to give any color with iodine. [ Webster 1913 Suppl. ]

n. [ Gr. &unr_; undistinguishable; 'a priv. + &unr_; to separate, distinguish + &unr_; color. ] Color blindness; achromatopsy. [ 1913 Webster ]

n. [ NL. acromegalia, fr. Gr. 'a`kron point, peak + me`gas, mega`loy, big. ] (Med.) Chronic enlargement of many bones of the skeleton, especially bones of hands, feet and face; the condition is due to excessive secretion of growth hormone. [ 1913 Webster + AS ]

a. [ Cf. F. acromial. ] (Anat.) Of or pertaining to the acromion. Dunglison. [ 1913 Webster ]

‖n. [ Gr. &unr_;; 'a`kros extreme + &unr_; shoulder: cf. F. acromion. ] (Anat.) The outer extremity of the shoulder blade. [ 1913 Webster ]

a. [ Gr. 'a`kros extreme + &unr_; alone + &unr_; a letter. ] Having each verse begin with the same letter as that with which the preceding verse ends. [ 1913 Webster ]

n. [ Aëro- + -mancy: cf. F. aéromancie. ] Divination from the state of the air or from atmospheric substances; also, forecasting changes in the weather. [ 1913 Webster ]

n. A mechanic or mechanician expert in the art and practice of aëronautics. [ Webster 1913 Suppl. ]

{ , a. Of or pert. to aëromechanics. [ Webster 1913 Suppl. ]

n. The science of equilibrium and motion of air or an aëriform fluid, including aërodynamics and aërostatics. [ Webster 1913 Suppl. ]

n. [ Aëro- + -meter: cf. F. éromètre. ] An instrument for ascertaining the weight or density of air and gases. [ 1913 Webster ]

a. Of or pertaining to aërometry; as, aërometric investigations. [ 1913 Webster ]

n. [ Aëro- + -metry: cf. F. érométrie. ] The science of measuring the air, including the doctrine of its pressure, elasticity, rarefaction, and condensation; pneumatics. [ 1913 Webster ]

n. [ Aëro- + Gr. &unr_; a running. ] (Aëronautics) (a) A shed for housing an airship or aëroplane. (b) A ground or field, esp. one equipped with housing and other facilities, used for flying purposes. -- A`ër*o*drom"ic a. [Webster 1913 Suppl.]

‖n. [ Native name. ] (Med.) A disease occurring in Bengal and other parts of the East Indies, in which the tongue chaps and cleaves. [ 1913 Webster ]

n. 1. an airfield equipped with control tower and hangers as well as accommodations for passengers and cargo.
Syn. -- airport, aerodrome [ WordNet 1.5 ]

n. [ Air + -meter. ] A hollow cylinder to contain air. It is closed above and open below, and has its open end plunged into water. [ 1913 Webster ]

n. [ Gr. &unr_; cock + &unr_; fight. ] Cockfighting. [ 1913 Webster ]

n. See Alectryomancy. [ 1913 Webster ]

n. [ Gr. &unr_; wheaten flour + -mancy: cf. F. aleuromancie. ] Divination by means of flour. Encyc. Brit. [ 1913 Webster ]

n. [ Gr. &unr_; flour + -meter. ] An instrument for determining the expansive properties, or quality, of gluten in flour. Knight. [ 1913 Webster ]

{ ‖ } n. [ Ampère + meter. ] (Physics) An instrument for measuring the strength of an electrical current in ampères. [ 1913 Webster ]

a. [ Gr. 'amfi`dromos running about or around. ] Pertaining to an Attic festival at the naming of a child; -- so called because the friends of the parents carried the child around the hearth and then named it. [ 1913 Webster ]

n. [ Cf. F. anadrome. ] (Zool.) A fish that leaves the sea and ascends rivers. [ 1913 Webster ]

a. [ Gr. &unr_; running upward; &unr_; + &unr_; a running, &unr_; to run. ] 1. (Zool.) Ascending rivers from the sea, at certain seasons, for breeding, as the salmon, shad, etc. [ 1913 Webster ]

2. (Bot.) Tending upwards; -- said of terns in which the lowest secondary segments are on the upper side of the branch of the central stem. D. C. Eaton. [ 1913 Webster ]

{ , n. } (Astron.) A meteor appearing to radiate from a point in the constellation Andromeda, -- whence the name. [ 1913 Webster ]

☞ A shower of these meteors takes place every year on November 27th or 28th. The Andromedes are also called Bielids, as they are connected with Biela's comet and move in its orbit. [ Webster 1913 Suppl. ]

n. [ L., fr. Gr. &unr_;, the daughter of Cepheus and Cassiopeia. When bound to a rock and exposed to a sea monster, she was delivered by Perseus. ] 1. (Astron.) A northern constellation, supposed to represent the mythical Andromeda. [ 1913 Webster ]

2. (bot.) A genus of ericaceous flowering plants of northern climates, of which the original species was found growing on a rock surrounded by water. [ 1913 Webster ]

n. [ Pref. anti- + Gr. &unr_; a stink. ] An agent that destroys offensive smells; a deodorizer. [ 1913 Webster ]

a. [ Pref. anti- + Gr. dro`mos a running. ] (Bot.) Changing the direction in the spiral sequence of leaves on a stem. [ 1913 Webster ]

a. [ Pref. apo- + chromatic. ] (Optics) Free from chromatic and spherical aberration; -- said esp. of a lens in which rays of three or more colors are brought to the same focus, the degree of achromatism thus obtained being more complete than where two rays only are thus focused, as in the ordinary achromatic objective. -- Ap`o*chro"ma*tism n. [Webster 1913 Suppl.]

v. t. [ Pref. ad- + promt. ] To quicken; to prompt. [ Obs. ] [ 1913 Webster ]

To appromt our invention. Bacon. [ 1913 Webster ]

n. [ L. aroma, Gr. &unr_;: cf. OE. aromaz, aromat, spice, F. aromate. ] 1. The quality or principle of plants or other substances which constitutes their fragrance; agreeable odor; as, the aroma of coffee. [ 1913 Webster ]

2. Fig.: The fine diffusive quality of intellectual power; flavor; as, the subtile aroma of genius. [ 1913 Webster ]

n. A plant, drug, or medicine, characterized by a fragrant smell, and usually by a warm, pungent taste, as ginger, cinnamon, spices. [ 1913 Webster ]

{ } a. [ L. aromaticus, Gr. &unr_;: cf. F. aromatique. See Aroma. ] Pertaining to, or containing, aroma; fragrant; spicy; strong-scented; odoriferous; as, aromatic balsam. [ 1913 Webster ]

Aromatic compound (Chem.), one of a large class of organic substances, as the oils of bitter almonds, wintergreen, and turpentine, the balsams, camphors, etc., many of which have an aromatic odor. They include many of the most important of the carbon compounds and may all be derived from the benzene group, C6H6. The term is extended also to many of their derivatives. --
Aromatic vinegar. See under Vinegar. [ 1913 Webster ]

n. [ Cf. F. aromatisation. ] The act of impregnating or secting with aroma. [ 1913 Webster ]

v. t. [ imp. & p. p. Aromatized p. pr. & vb. n. Aromatizing. ] [ L. aromatizare, Gr. &unr_;: cf. F. aromatiser. ] To impregnate with aroma; to render aromatic; to give a spicy scent or taste to; to perfume. Bacon. [ 1913 Webster ]

n. One who, or that which, aromatizes or renders aromatic. Evelyn. [ 1913 Webster ]