achromatic
111tristimulus system — ▪ colour a system for visually matching a colour under standardized conditions against the three primary colours red, green, and blue; the three results are expressed as X, Y, and Z, respectively, and are called tristimulus values. For… …
112achromatism — 1. The quality of being achromatic. 2. The annulment of chromatic aberration by combining glasses of different refractive indexes and different dispersion. * * * achro·ma·tism ( )ā krō mə .tiz əm, a n the quality or state of being achromatic * *… …
113achromatise — verb remove color from achromatize the lenses • Syn: ↑achromatize • Derivationally related forms: ↑achromatic (for: ↑achromatize) • Hypernyms: ↑ …
114blackness — noun 1. the quality or state of the achromatic color of least lightness (bearing the least resemblance to white) (Freq. 4) • Syn: ↑black, ↑inkiness • Ant: ↑white (for: ↑black) …
115grayness — noun a neutral achromatic color midway between white and black • Syn: ↑gray, ↑grey, ↑greyness • Derivationally related forms: ↑grey (for: ↑greyness), ↑grey ( …
116greyness — noun a neutral achromatic color midway between white and black • Syn: ↑gray, ↑grayness, ↑grey • Derivationally related forms: ↑grey, ↑grey (for: ↑grey), ↑gray …
117inkiness — noun the quality or state of the achromatic color of least lightness (bearing the least resemblance to white) • Syn: ↑black, ↑blackness • Ant: ↑white (for: ↑black) • Derivationally related forms: ↑ …
118whiteness — noun 1. the quality or state of the achromatic color of greatest lightness (bearing the least resemblance to black) (Freq. 1) • Syn: ↑white • Ant: ↑black (for: ↑white) • Derivationally related forms: ↑ …
119Aplanatic telescope — Telescope Tel e*scope, n. [Gr. ? viewing afar, farseeing; ? far, far off + ? a watcher, akin to ? to view: cf. F. t[ e]lescope. See {Telegraph}, and { scope}.] An optical instrument used in viewing distant objects, as the heavenly bodies. [1913… …
120Astronomical telescope — Telescope Tel e*scope, n. [Gr. ? viewing afar, farseeing; ? far, far off + ? a watcher, akin to ? to view: cf. F. t[ e]lescope. See {Telegraph}, and { scope}.] An optical instrument used in viewing distant objects, as the heavenly bodies. [1913… …
