n. [ A humorous variation on the term amber mutation. ] (Microbiology, Molecular biology) A mutation in which the base sequence of one of the codons in the messenger RNA has been converted to UAA. Such a mutation may be conditionally suppressed, as can an amber mutation, by the presence of a special transfer RNA. -- ocher mutant, n. [ PJC ]
{ } n. [ F. ocre, L. ochra, fr. Gr. &unr_;, from (&unr_;) pale, pale yellow. ] 1. (Min.) (a) A impure earthy ore of iron or a ferruginous clay, usually red (hematite) or yellow (limonite), -- used as a pigment in making paints, etc. The name is also applied to clays of other colors. (b) A metallic oxide occurring in earthy form; as, tungstic ocher or tungstite. [ 1913 Webster ]
2. The color of ocher{ 1 }, varying around orange, from more yellowish to more reddish in tint. [ PJC ]
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