† protoceren. [ < proto-comb. form + ancient Greek κέρας horn (see kerato-comb. form)] Obsoleterare a rudimentary antler of a deer; (part of) the antler of a young deer.Apparently only attested in dictionaries or glossaries.
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1890 Cent. Dict.Protocere, the rudiment of the antler of a deer, or that process of the antler which is best developed in the second year.