1. Of or pertaining to shells; consisted of a hard shell, or having a hard shell.

2. (Science: botany) Having a dull red brick colour or a brownish yellow colour.

(Science: zoology) Testaceous animals, animals having a firm, calcareous shell, as oysters and clams, thus distinguished from crustaceous animals, whose shells are more thin and soft, and consist of several joints, or articulations, as lobsters and crabs.

Origin: L. Testaceus, fr. Testa a shell. See Testa.

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