[ oh-peyk ]
/ oʊˈpeɪk /



something that is opaque.
Photography. a coloring matter, usually black or red, used to render part of a negative opaque.

verb (used with object), o·paqued, o·paqu·ing.

Photography. to cover up blemishes on (a negative), especially for making a printing plate.
to cause to become opaque.

Origin of opaque

1375–1425; late Middle English opake < Latin opācus shaded

Related forms

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for opaque

British Dictionary definitions for opaque


/ (əʊˈpeɪk) /



photog an opaque pigment used to block out particular areas on a negative

verb opaques, opaquing or opaqued (tr)

to make opaque
photog to block out particular areas, such as blemishes, on (a negative), using an opaque

Derived Forms

opaquely, adverbopaqueness, noun

Word Origin for opaque

C15: from Latin opācus shady
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for opaque


[ ō-pāk ]


Impenetrable by light; neither transparent nor translucent.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for 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.

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.