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Clasping the stem, as the bases of certain leaves do.
[Latin amplexus, an embracing; see amplexus + Latin caulis, stem.]
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.
(Botany) (of some sessile leaves, stipules, etc) having an enlarged base that encircles the stem
[C18: from New Latin amplexicaulis, from Latin amplectī to embrace + caulis stalk]
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