‖Tes′ti‐car″di‐nes (?), n. pl. [NL. See Test a shell, and Cardo.] (Zoöl.) A division of brachiopods including those which have a calcareous shell furnished with a hinge and hinge teeth. Terebratula and Spirifer are examples.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.