ocher mutation

o´cher mu´tation

n.1.(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.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.