testa

noun

(botany) A seed coat. / (marine biology) The external calciferous shell, or endoskeleton, of an echinoderm; the test.

The testa of the seed is hard and protective.

意味（1）

(botany) A seed coat.

The testa develops from the tissue, the integument, originally surrounding the ovule.

意味（2）

(marine biology) The external calciferous shell, or endoskeleton, of an echinoderm; the test.