† pre-apicialadj.ConchologyObsoleterare designating the hinge of a bivalve shell when situated just in front of the umbones.Apparently only attested in dictionaries or glossaries.
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1858 R. G. MayneExpos. Lexicon Med. Sci. (1860) 1012/1Præapicialis,..applied to the hinge of a bivalve shell, when, being on the back of the valve, it is before the summit: preapicial.