adj. & n.
--adj. (opaquer, opaquest)
1. not transmitting light.
2 impenetrable to sight.
3 obscure; not lucid.
4 obtuse, dull-witted.
--n.
1. an opaque thing or substance.
2 a substance for producing opaque areas on negatives.
Derivatives:
opaquely adv. opaqueness n.
Etymology: ME opak f. L opacus: spelling now assim. to F