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 ]

{ } a. [ Gr. &unr_;, fr. &unr_; to hear. ] Communicated orally; oral; -- applied to the esoteric teachings of Aristotle, those intended for his genuine disciples, in distinction from his exoteric doctrines, which were adapted to outsiders or the public generally. Hence: Abstruse; profound. [ 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 ]

{ } a. [ Cf. F. anagrammatique. ] Pertaining to, containing, or making, an anagram. -- An`a*gram*mat"ic*al*ly, adv. [1913 Webster]

a. [ Gr. &unr_;; 'an priv. + &unr_; a change. ] (Math.) Not changed in form by inversion. [ 1913 Webster ]

Anallagmatic curves, a class of curves of the fourth degree which have certain peculiar relations to circles; -- sometimes called bicircular quartics. --
Anallagmatic surfaces, a certain class of surfaces of the fourth degree. [ 1913 Webster ]

a. [ Pref. an-not + astigmatic. ] (Optics) Not astigmatic; free of astigmatism; -- pertaining to a lens or lens system, and used especially of a lens system which consists of a converging lens and a diverging lens of equal and opposite astigmatism but different focal lengths, and sensibly free from astigmatism. [ Webster 1913 Suppl. + WordNet 1.5 ]

a. Pertaining to, or having the nature of, an anathema. -- A*nath`e*mat"ic*al*ly, adv. [1913 Webster]

adj. 1. of or pertaining to an aneurysm.
Syn. -- aneurismal [ WordNet 1.5 ]

n. 1. a sac-like widening of a blood vessel. [ WordNet 1.5 ]

a. [ Gr. 'an priv. + E. idiomatical. ] Not idiomatic. [ R. ] Landor. [ 1913 Webster ]

a. [ Pref. anti- + asthmatic. ] (Med.) Opposing, or fitted to relieve, asthma. -- n. A remedy for asthma. [ 1913 Webster ]

a. [ Pref. anti- + asthmatic. ] (Med.) Opposing, or fitted to relieve, asthma. -- n. A remedy for asthma. AS [ 1913 Webster ]

a. & n. Same as Antasthmatic. [ 1913 Webster ]

a. (Med.) Antistrumous. -- n. A medicine for scrofula. [ 1913 Webster ]

{ } a. Pertaining to aphorisms, or having the form of an aphorism. [ 1913 Webster ]

a. [ Gr. &unr_; not blown through. ] (Med.) Devoid of air; free from air; as, an apneumatic lung; also, effected by or with exclusion of air; as, an apneumatic operation. [ Webster 1913 Suppl. ]

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.]

a. [ Gr. &unr_;; &unr_; from + &unr_; full of phlegm. See Phlegmatic. ] (Med.) Designed to facilitate discharges of phlegm or mucus from mouth or nostrils. -- n. An apophlegmatic medicine. [ 1913 Webster ]

a. Same as Apothegmatic. [ 1913 Webster ]

a. [ Pref. apo- + sematic. ] (Zool.) Having or designating conspicuous or warning colors or structures indicative of special means of defense against enemies, as in the skunk. [ Webster 1913 Suppl. ]

a. [ Gr. &unr_;, fr. &unr_; effect of the stars on human destiny, fr. &unr_; to complete; &unr_; from + &unr_; to end, &unr_; end. ] 1. Relating to the casting of horoscopes. [ Archaic ] Whewell. [ 1913 Webster ]

2. Relating to an issue of fulfillment. [ 1913 Webster ]

In this way a passage in the Old Testament may have, or rather comprise, an apotelesmatic sense, i. e., one of after or final accomplishment. M. Stuart. [ 1913 Webster ]

{ } a. [ Gr. 'apofqegmatiko`s. ] Pertaining to, or in the manner of, an apothegm; sententious; pithy. [ 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. A person affected with asthma. [ 1913 Webster ]

{ } a. [ L. asthmaticus, Gr. &unr_;. ] Of or pertaining to asthma; as, an asthmatic cough; liable to, or suffering from, asthma; as, an asthmatic patient. -- Asth*mat"ic*al*ly, adv. [1913 Webster]

a. (Med. & Opt.) Affected with, or pertaining to, astigmatism; as, astigmatic eyes; also, remedying astigmatism; as, astigmatic lenses. [ 1913 Webster ]

adj. (Med.) showing no symptoms of disease.
Syn. -- symptomless. [ WordNet 1.5 ]

n. 1. light machine gun.
Syn. -- automatic rifle, machine rifle [ WordNet 1.5 ]

2. a pistol that will keep firing until the ammunition is gone or the trigger is released; as, a .45 automatic.
Syn. -- automatic pistol. [ WordNet 1.5 ]

{ } a. [ Cf. F. automatique. See Automaton. ] 1. Having an inherent power of action or motion. [ 1913 Webster ]

Nothing can be said to be automatic. Sir H. Davy. [ 1913 Webster ]

2. Pertaining to, or produced by, an automaton; of the nature of an automaton; self-acting or self-regulating under fixed conditions; operating with minimal human intervention; -- esp. applied to machinery or devices in which certain things formerly or usually done by hand are done by the machine or device itself; as, the automatic feed of a lathe; automatic gas lighting; an automatic engine or switch; an automatic mouse; an automatic transmission. The opposite of manual. Narrower terms are: autoloading(prenominal), semiautomatic ; automated, machine-controlled, machine-driven ; self-acting, self-activating, self-moving, self-regulating ; self-locking ; self-winding . Also See: mechanical. [ 1913 Webster + WordNet 1.5 ]

3. (Physiol.) Not voluntary; not depending on the will; mechanical; controlled by the autonomic nervous system; without conscious control; as, automatic movements or functions. The opposite of voluntary.
Syn. -- reflex(prenominal), reflexive, involuntary [ 1913 Webster + WordNet 1.5 ]

Unconscious or automatic reasoning. H. Spenser. [ 1913 Webster ]

4. like the unthinking functioning of a machine. an automatic `thank you'
Syn. -- automaton-like, automatonlike, machinelike, machine-like, robotlike. [ WordNet 1.5 ]

Automatic arts, such economic arts or manufacture as are carried on by self-acting machinery. Ure. [ 1913 Webster ]

adv. In an automatic manner. [ 1913 Webster ]

a. [ Auto- + pneumatic. ] Acting or moving automatically by means of compressed air. [ Webster 1913 Suppl. ]

{ } a. [ Gr. &unr_;. ] Of or pertaining to an axiom; having the nature of an axiom; self-evident; characterized by axioms. “Axiomatical truth.” Johnson. [ 1913 Webster ]

The stores of axiomatic wisdom. I. Taylor. [ 1913 Webster ]

adv. By the use of axioms; in the form of an axiom. [ 1913 Webster ]

adj. of or pertaining to biosystematics. [ WordNet 1.5 ]

n. use of data (e. g. cytogenetic or biochemical) to assess taxonomic relations esp within an evolutionary framework.
Syn. -- biosystematy. [ WordNet 1.5 ]

a. (Biol.) Connected with, or proceeding from, the blastema; blastemal. [ 1913 Webster ]

{ } a. Of or pertaining to the blastoderm. [ 1913 Webster ]

a. (Anat.) Pertaining to the bregma. [ 1913 Webster ]

a. [ Gr. &unr_; fracture, fr. &unr_; to break in places; kata` down + 'agny`nai to break: cf. F. catagmatique. ] (Med.) Having the quality of consolidating broken bones. [ 1913 Webster ]

a. [ Gr. &unr_; predicate. See Category. ] (Logic.) Capable of being employed by itself as a term; -- said of a word. [ 1913 Webster ]

a. Of or pertaining to a charism. [ 1913 Webster ]

adj. of or pertaining to a chiasma. [ WordNet 1.5 ]

a. [ L. chromaticus, Gr. &unr_;, suited for color, fr. &unr_;, &unr_;, color; akin to &unr_; color, &unr_; skin, color of the skin. ] 1. Relating to color, or to colors. [ 1913 Webster ]

2. (Mus.) Proceeding by the smaller intervals (half steps or semitones) of the scale, instead of the regular intervals of the diatonic scale. [ 1913 Webster ]

☞ The intermediate tones were formerly written and printed in colors. [ 1913 Webster ]

Chromatic aberration. (Opt.) See Aberration, 4. --
Chromatic printing, printing from type or blocks covered with inks of various colors. --
Chromatic scale (Mus.), the scale consisting of thirteen tones, including the eight scale tones and the five intermediate tones. [ 1913 Webster ]

a. Chromatic. [ Obs. ] [ 1913 Webster ]

adv. In a chromatic manner. [ 1913 Webster ]

n. the quality of a color as determined by its dominant wavelength.
Syn. -- hue. [ WordNet 1.5 ]

n. The science of colors; that part of optics which treats of the properties of colors. [ 1913 Webster ]

{ } a. [ Cf. F. chronogrammatique. ] Belonging to a chronogram, or containing one. [ 1913 Webster ]