tegmentum

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teg·men·tum

 (tĕg-mĕn′təm) Anatomy
n.
1. A covering or integument of an organ or body part.
2. The ventral part of the midbrain.

[Latin tegumentum, tegmentum, covering, from tegere, to cover; see (s)teg- in Indo-European roots.]

teg·men′tal (-təl) adj.
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.

tegmentum

(tɛɡˈmɛntʌm)
n
one of the hard protective sometimes hairy or resinous specialized leaves surrounding the buds of certain plantsa part of the brainstem that covers the floor of the midbrain
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014