The Collaborative International Dictionary
Testaceous animals
Testaceous \Tes*ta"ceous\, a. [L. testaceus, fr. testa a shell. See Testa.]
Of or pertaining to shells; consisted of a hard shell, or having a hard shell.
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(Bot. & Zo["o]l.) Having a dull red brick color or a brownish yellow color.
Testaceous animals (Zo["o]l.), 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.