Science / Geology / Opaque: An adjective used in reference to a substance that does not allow light of visible wavelength to enter or pass through. Minerals with a metallic or submetallic luster are normally opaque.
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Other Words for Opaque

Opaque Adjective Synonyms: unclear, vague, indefinite, obscure, unfathomable, unplumbable, baffling, mystifying, ambiguous, equivocal, impenetrable, cryptic, enigmatic, puzzling, perplexing, mysterious, elusive, abstruse, arcane, recondite
Opaque Noun Synonyms: dark, murky, dim, turbid, muddy, cloudy, obscure, obscured, obfuscated, black, impermeable, impenetrable, clouded, non-transparent, untransparent, non-translucent, hazy, blurred, blurry, smoky

Opaque Stain

Life Style / Painting / Opaque Stain: An exterior stain that obscures the natural color and grain of wood, but still allows the texture to show through. MORE

Opaque Coating

Life Style / Painting / Opaque Coating: A coating that hides the previous surface coating. MORE

Opaque Mineral

Science / Geology / Opaque Mineral: A mineral which transmits no light through a thin section under a microscope. Usually a native metal, sulfide, or metallic oxide mineral. MORE

Opaque Liquid

Entertainment / Photography / Opaque Liquid: Is a dense red or black pigment, dissolved in water to form a liquid paint used to fill in film areas that are required to pint as pure white. MORE

Lens Hood

Entertainment / Photography / Lens Hood: Opaque tube, either cylindrical, square of funnel shaped, use to shield a lens from stray light outside the field of view. MORE

Changing Bag

Entertainment / Photography / Changing Bag: Opaque fabric bag, which is light tight and inside sensitive materials may be handled safely. MORE