| opacification | (noun) the process of becoming cloudy or opaque | - |
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| opacify | (verb) become opaque | - |
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| (verb) make opaque | - |
| opacity | (noun) the quality of being opaque to a degree; the degree to which something reduces the passage of light | Synonyms: opaqueness |
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| (noun) incomprehensibility resulting from obscurity of meaning | Synonyms: opaqueness |
| (noun) the phenomenon of not permitting the passage of electromagnetic radiation | - |
| opah | (noun) large elliptical brightly colored deep-sea fish of Atlantic and Pacific and Mediterranean | Synonyms: Lampris regius, moonfish |
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| opal | (noun) a translucent mineral consisting of hydrated silica of variable color; some varieties are used as gemstones | - |
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| opalesce | (verb) exhibit a play of colors like that of an opal | - |
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| (verb) reflect light or colors like an opal | - |
| opalescence | (noun) the visual property of something having a milky brightness and a play of colors from the surface | Synonyms: iridescence |
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| opalescent | (adjective) having a play of lustrous rainbow colors | Synonyms: iridescent, nacreous, opaline, pearlescent |
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| opaline | (adjective) having a play of lustrous rainbow colors | Synonyms: iridescent, nacreous, opalescent, pearlescent |
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| opalise | (verb) replace or convert into opal | Synonyms: opalize |
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| (verb) make opalescent | Synonyms: opalize |
| opalize | (verb) replace or convert into opal | Synonyms: opalise |
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| (verb) make opalescent | Synonyms: opalise |
| opaque | (adjective) not transmitting or reflecting light or radiant energy; impenetrable to sight | - |
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| (adjective) hard or impossible to understand | Synonyms: unintelligible |
| opaquely | (adverb) in an opaque manner | - |
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| opaqueness | (noun) the quality of being opaque to a degree; the degree to which something reduces the passage of light | Synonyms: opacity |
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| (noun) incomprehensibility resulting from obscurity of meaning | Synonyms: opacity |