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Variant of ocrea.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
n, pl -reae (-rɪˌiː)
(Botany) a cup-shaped structure that sheathes the stems of certain plants, formed from united stipules or leaf bases
[C19: from Latin ocrea greave, legging, of obscure origin]
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