Achiote
(||A`chi*o"te) n. [Sp. achiote, fr. Indian achiotl.] Seeds of the annotto tree; also, the coloring
matter, annotto.
Achlamydate
(A*chlam"y*date) a. [Gr. 'a priv. + . . a short cloak.] (Zoöl.) Not possessing a mantle; —
said of certain gastropods.
Achlamydeous
(Ach`la*myd"e*ous) a. (Bot.) Naked; having no floral envelope, neither calyx nor corolla.
Acholia
(||A*cho"li*a) n. [NL., from Gr. 'a priv. + bile.] (Med.) Deficiency or want of bile.
Acholous
(Ach"o*lous) a. (Med.) Lacking bile.
Achromatic
(Ach`ro*mat"ic) a. [Gr. colorless; 'a priv. + color: cf. F. achromatique.]
1. (Opt.) Free from color; transmitting light without decomposing it into its primary colors.
2. (Biol.) Uncolored; not absorbing color from a fluid; — said of tissue.
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.
Achromatically
(Ach`ro*mat"ic*al*ly) adv. In an achromatic manner.
Achromaticity
(Ach`ro*ma*tic"i*ty) n. Achromatism.
Achromatin
(A*chro"ma*tin) n. (Biol.) Tissue which is not stained by fluid dyes. W. Flemming.
Achromatism
(A*chro"ma*tism) n. [Cf. F. achromatisme.] The state or quality of being achromatic; as,
the achromatism of a lens; achromaticity. Nichol.
Achromatization
(A*chro`ma*ti*za"tion) n. [Cf. F. achromatisation.] The act or process of achromatizing.
Achromatize
(A*chro"ma*tize) v. t. [imp. & p. p. Achromatized ; p. pr. & vb. n. Achromatizing ] [Gr.
'a priv. + color.] To deprive of color; to make achromatic.
Achromatopsy
(A*chro"ma*top"sy) n. [Gr. 'a priv. + color + sight.] Color blindness; inability to distinguish
colors; Daltonism.
Achronic
(A*chron"ic) a. See Acronyc.
Achroödextrin
(Ach`ro*ö*dex"trin) n. [Gr. colorless + E. dextrin.] (Physiol. Chem.) Dextrin not colorable
by iodine. See Dextrin.
Achroous
(Ach"ro*ous) a. [Gr. 'a priv. + color.] Colorless; achromatic.
Achylous
(A*chy"lous) a. (Physiol.) Without chyle.
Achymous
(A*chy"mous) a. (Physiol.) Without chyme.
Acicula
(||A*cic"u*la) n.; pl. Aciculæ [L., a small needle, dimin. of acus needle.] (Nat. Hist.) One of
the needlelike or bristlelike spines or prickles of some animals and plants; also, a needlelike crystal.
