TEST (5)

{ Test (?), ‖Tes″ta (?), } n.; pl. E. Tests (#), L. Testæ (#). [[L. testa a piece of burned clay, a broken piece of earthenware, a shell. See Test a cupel.]] 1. 1. (Zoöl.) The external hard or firm covering of many invertebrate animals.
☞ 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. 2. 2. (Bot.) The outer integument of a seed; the episperm, or spermoderm.