testa

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tes·ta

(tes'tă),
1. In protozoology, usually termed test; an envelope of certain forms of ameboid protozoa, consisting of various earthy materials cemented to a chitinous base (as in the testate rhizopods of the subclass Testacealobosia) or the calcareous, siliceous, organic, or strontium sulfate skeletons in the rhizopod subclass Foraminifera.
2. In botany, the outer, sometimes the only, coat of a seed.
[L. shell]

testa

[tes′tə]
Etymology: L, a shell
1 an eggshell.
2 powdered oyster shells used in antacids.
3 the outer coat of a seed.

tes·ta

(tes'tă)
1. In protozoology, usually termed test; an envelope of certain forms of ameboid protozoa, consisting of various early materials cemented to a chitinous base (as in the testate rhizopods of the subclass Testacealobosia) or the calcareous, siliceous, organic, or strontium sulfate skeletons in the rhizopod subsclass Foraminifera.
Synonym(s): test (6).
2. In botany, the outer, sometimes the only, coat of a seed.
[L. shell]

testa

a protective coat around the seed, formed from the INTEGUMENTS of the OVULE. At one area on the testa is the hilum, at one end of which is often found the MICROPYLE. Sometimes the testa is responsible for seed dormancy, a state which is broken when the coat ruptures (see GERMINATION).
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