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mentum

[men-tuh m]
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noun, plural men·ta [men-tuh] /ˈmɛn tə/.
  1. Entomology. the medial plate of the labium in insects.
  2. Botany. a chinlike protuberance formed by the sepals and the base of the column in some orchids.
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Origin of mentum

1685–95; < New Latin, Latin mentum chin, akin to mouth
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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mentum in Medicine

mentum

(mĕntəm)
n. pl. men•ta (-tə)
  1. The chin.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.