[ ten-tawr-ee-uh m, -tohr- ]
/ tɛnˈtɔr i əm, -ˈtoʊr- /

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 forms

ten·to·ri·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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Medicine definitions for tentorium


[ tĕn-tôrē-əm ]

n. pl. ten•to•ri•a (-tôrē-ə)

A membranous cover or horizontal partition.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.