tentorium

[ten-tawr-ee-uh m, -tohr-]

noun, plural ten·to·ri·a

[ten-tawr-ee-uh, -tohr-] /tɛnˈtɔr i ə, -ˈtoʊr-/.

Anatomy. an extension of one of the membranes covering the cerebrum which, with the transverse fissure, separates the cerebrum from the cerebellum.
Zoology. (of an insect) the internal skeleton of the head.

Origin of tentorium

1655–65; < New Latin tentōrium, Latin: tent, equivalent to ten(dere) to extend, stretch + -tōrium -tory²

Related formsten·to·ri·al, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

After locating the occipital knob, a horizontal line forward will give us the portion of the tentorium.
Buchanan's Journal of Man, April 1887
Various
Tentorium: a chitinous frame-work within the head, upon which the brain rests.
Explanation of Terms Used in Entomology
John. B. Smith
The Cerebrum or Great Brain lies above the plane of the tentorium, and forms much the largest division of the encephalon.
Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 4
Various

tentorium in Medicine

(tĕn-tôr′ē-əm)

n. pl. ten•to•ri•a (-tôr′ē-ə)