Definify.com
Webster 1913 Edition
Testa
{
Test
, ‖Tes′ta
, }Noun.
pl. E.
Tests
(#)
, L. Testae
(#)
. [L.
testa
a piece of burned clay, a broken piece of earthenware, a shell. See Test
a cupel.] 1.
(Zool.)
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.
(Bot.)
The outer integument of a seed; the episperm, or spermoderm.