The Collaborative International Dictionary
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.
Wiktionary
a. 1 (context obsolete English) Pertaining to earthenware or baked clay. 2 Of a reddish-yellow or brownish colour, like brick. 3 Having a shell, especially one which is not articulated.
WordNet
adj. relating to or possessing a test
relating to or possessing a testa; "testaceous echinoderms"
Usage examples of "testaceous".
Testaceous turbinated exanguious animals—and before you ask, I have subdivided them into those with, and without, spiral convolutions.