testa

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testa

a hard protective outer layer of the seeds of flowering plants; seed coat
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

testa

[′tes·tə]
(botany)
A seed coat. Also known as episperm.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.