| opal | <chemical> A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity. The precious opal presents a peculiar play of colours of delicate tints, and is highly esteemed as a gem. One kind, with a varied play of colour in a reddish ground, is called the harlequin opal. The fire opal has colours like the red and yellow of flame. Common opal has a milky appearance. Menilite is a brown impure variety, occurring in concretions at Menilmontant, near Paris. Other varieties are cacholong, girasol, hyalite, and geyserite. Origin: L. Opalus: cf. Gr, Skr. Upala a rock, stone, precious stone: cf. F. Opale. Source: Websters Dictionary (01 Mar 1998) |
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| opal codon | <molecular biology> The codon UGA, one of the three that causes termination of protein synthesis. (18 Nov 1997) |
| opal mutation | <molecular biology> Mutation that changes any codon to the termination codon UGA. (18 Nov 1997) |
| opal suppressor | <molecular biology> A gene that codes for an altered tRNA so that its anticodon can recognise the opal codon and thus allows the continuation of protein synthesis. A suppressor of an opal mutation is a tRNA that is charged with the amino acid corresponding to the original codon or a neutral substitute. Some eukaryote cells normally synthesise opal suppressor tRNAs. The function of these is not clear and they usually do not prevent normal termination of protein synthesis at an opal codon. (18 Nov 1997) |
| opalescence | <chemical> A reflection of a milky or pearly light from the interior of a mineral, as in the moonstone; the state or quality of being opalescent. Source: Websters Dictionary (01 Mar 1998) |
| opalescent | Showing a milky iridescence, like an opal. (18 Nov 1997) |
| opalescent dentin | Dentin usually associated with dentinogenesis imperfecta. It gives an unusual opalescent or translucent appearance to the teeth. Synonym: hereditary opalescent dentin. (05 Mar 2000) |
| Opalina | <protozoa> A genus of parasitic protozoans found in the guts of frogs and toads. They look superficially like ciliates, but are classified in a separate group as they have a number of similar nuclei. (18 Nov 1997) |
| opaline patch | A mucous patch of silver-gray appearance. (05 Mar 2000) |
| Opalski cell | A characteristically altered glial cell in the basal ganglia and thalamus in hepatocerebral degeneration and Wilson's disease. (05 Mar 2000) |
| Opalski, Adam | <person> Polish physician, 1897-1963. See: Opalski cell. (05 Mar 2000) |
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| opalescent |
iridescent: having a play of lustrous rainbow-like colors; "an iridescent oil slick"; "nacreous (or pearlescent) clouds looking like mother-of-pearl"; "a milky opalescent (or opaline) luster"
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| opaline |
iridescent: having a play of lustrous rainbow-like colors; "an iridescent oil slick"; "nacreous (or pearlescent) clouds looking like mother-of-pearl"; "a milky opalescent (or opaline) luster"
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| opalescent |
having a lustrous finish like the colors of an opal stone or the rainbow
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| opalescent |
Like opal, a material with a cloudy-white translucent appearance.
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| opalescent |
Reflecting an iridescent light; having a milky iridescence.
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| opal | a translucent mineral consisting of hydrated silica of variable color |
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| opal | a milky white translucent or opaque glass |
| opal | exhibit a play of colors like that of an opal |
| opal | reflect light or colors like an opal |
| opal | the visual property of something having a milky brightness |
| opal | having a play of lustrous rainbow-like colors |
| opal | having a play of lustrous rainbow-like colors |
| opal | replace or convert into opal |
| opal | make opalescent |
| opal | replace or convert into opal |
| opal | make opalescent |
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