| 释义 |
opac·i·ty
\ōˈpasəd.ē, -sətē, -i\ noun
(-es)
Etymology: French opacité, from Latin opacitat-, opacitas, from opacus shaded, dark + -itat-, -itas -ity
1. : the quality or state of an instance of being shaded or obscure : darkness, obscurity
2.
a. : the quality or state of a body that renders it impervious to the rays of light : lack of transparency or translucency
b. : degree of nontransparency
< titanium dioxide has the greatest opacity and tinctorial strength of all white pigments — Andries Voet >
c. : the property of a photographic image that causes partial absorption of rays of light
d. : the capacity of matter to obstruct by absorption or reflection the transmission of forms of radiant energy in addition to light (as radio waves, infrared radiation, sound)
< the opacity to ultrasound of porous media — A.B.Wood >
also : a measure of this capacity : the reciprocal of the transmissivity
3.
a. : obscurity of sense : lack of clearness : unintelligibleness
b. : mental dimness or obtuseness : dullness
4. : an opaque spot on a normally transparent structure (as the cornea or lens of the eye) |