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- noun biochemistry A natural
analogueof vitamin B12, a basic member of the cobalaminfamily of compounds, with an intense red colour.
Sorry, no etymologies found.
Several substances with similar formulas and with the characteristic hematinic action have been isolated and designated: B12a, hydroxocobalamin; B12b, aquacobalamin; B12c, nitritocobalamin; B12r, cob (II) alamin; B12s, cob (I) alamin; B12III, factors A and V1a (cobyric acid) and pseudovitamin B12.