teg·men·tum 
(tĕg-mĕntəm) Anatomy
(tĕg-mĕntəm) 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 the Appendix of Indo-European roots.]
teg·mental (-təl) adj.