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.