noun, plural o·pac·i·ties.
Origin of opacity
Examples from the Web for opacity
Special attention should be given to the position of the opacity.
This sulphuring is simply the result of opacity, obtained by heating the glass to too high a temperature.British Manufacturing Industries|L. Arnoux
The opacity is remarkably high, explaining why the star is so nearly "heat-tight."Astronomy|David Todd
They were of every color from absolute pallor, the opacity of plaster, to utter blackness.San Cristbal de la Habana|Joseph Hergesheimer
Nevertheless, the opacity of the Earth, like the transparency of the air, frequently deceives and bewilders us.The Sea|Jules Michelet
British Dictionary definitions for opacity
noun plural -ties
Word Origin and History for opacity
1550s, "darkness of meaning, obscurity," from French opacité, from Latin opacitatem (nominative opacitas) "shade, shadiness," from opacus "shaded, dark, opaque" (see opaque). The literal sense "condition of being impervious to light" first recorded 1630s.