GNU Collaborative International Dictionary of English

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1.       
   { Test , ‖Testa , } n.; pl. E. Tests , L. Testae . [L. testa a piece of burned clay, a broken piece of earthenware, a shell. See Test a cupel.]
   (Zool.) The external hard or firm covering of many invertebrate animals.
   1913 Webster
   ☞ The test of crustaceans and insects is composed largely of chitin; in mollusks it is composed chiefly of calcium carbonate, and is called the shell.
   1913 Webster
   (Bot.) The outer integument of a seed; the episperm, or spermoderm.
   1913 Webster