Opaque

[oh-peyk] /oʊˈpeɪk/

adjective
1.
not transparent or translucent; impenetrable to light; not allowing light to pass through.
2.
not transmitting radiation, sound, heat, etc.
3.
not shining or bright; dark; dull.
4.
hard to understand; not clear or lucid; obscure:
The problem remains opaque despite explanations.
5.
dull, stupid, or unintelligent.
noun
6.
something that is opaque.
7.
Photography. a coloring matter, usually black or red, used to render part of a negative opaque.
verb (used with object), opaqued, opaquing.
8.
Photography. to cover up blemishes on (a negative), especially for making a printing plate.
9.
to cause to become opaque.
/əʊˈpeɪk/
adjective
1.
not transmitting light; not transparent or translucent
2.
not reflecting light; lacking lustre or shine; dull
3.
not transmitting radiant energy, such as electromagnetic or corpuscular radiation, or sound
4.
hard to understand; unintelligible
5.
unintelligent; dense
noun
6.
(photog) an opaque pigment used to block out particular areas on a negative
verb (transitive) opaques, opaquing, opaqued
7.
to make opaque
8.
(photog) to block out particular areas, such as blemishes, on (a negative), using an opaque
adj.

early 15c., opake, from Latin opacus “shaded, in the shade, shady, dark, darkened, obscure,” of unknown origin. Spelling influenced after c.1650 by French opaque (c.1500), from the Latin. Figurative use from 1761. Related: Opaquely; opaqueness.

opaque o·paque (ō-pāk’)
adj.
Impenetrable by light; neither transparent nor translucent.
opaque
(ō-pāk’)
Resistant to the transmission of certain kinds of radiation, usually light. Metals and many minerals are opaque to light, while being transparent to radio waves and neutrinos. Compare translucent, transparent.