from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Impenetrable by light; neither transparent nor translucent.
- adj. Not reflecting light; having no luster: an opaque finish.
- adj. Impenetrable by a form of radiant energy other than visible light: a chemical solution opaque to x-rays.
- adj. So obscure as to be unintelligible: "opaque, elusive, minimal meanings” ( John Simon).
- adj. Obtuse of mind; dense. See Synonyms at dark.
- n. Something that is opaque, especially an opaque pigment used to darken parts of a photographic print or negative.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Neither reflecting nor emitting light.
- adj. Allowing little light to pass through, not translucent or transparent.
- adj. Unclear, unintelligible, hard to get or explain the meaning of
- adj. Obtuse, stupid.
- adj. Describes a type for which higher-level callers have no knowledge of data values or their representations; all operations are carried out by the type's defined abstract operators.
- n. An area of darkness; a place or region with no light.
- n. Something which is opaque rather than translucent.
- v. To make, render (more) opaque.
from the GNU version of the Collaborative International Dictionary of English
- adj. Impervious to the rays of light; not transparent.
- adj. Obscure; not clear; unintelligible.
- n. That which is opaque; opacity.
from The Century Dictionary and Cyclopedia
- Shady; dark; hence, obscure.
- Impervious to the rays of light; not transparent.
- In entomology, having no luster: said of surfaces or colors.
- In botany, mostly used in the sense of ‘not shining,’ or ‘dull.’
- A similar ware made at Spode, introduced in 1805. Also called feldspar porcelain and ironstone china.
- n. Opacity.
- To render opaque.
- n. Something opaque; specifically, a shade which can be worn over the forehead to protect the eyes from brilliant light.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. not clearly understood or expressed
- adj. not transmitting or reflecting light or radiant energy; impenetrable to sight
Middle English opake, shady, and French opaque, opaque (from Old French, shady), both from Latin opācus.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle English opake, from Latin opacus ("shaded, shady, dark") (of unknown origin), later reinforced from Middle French opaque. (Wiktionary)