[ten-tawr-ee-uhm, -tohr-]
noun, plural tentoria [ten-tawr-ee-uh, -tohr-] .
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.

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

tentorial, adjective
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Medical Dictionary

tentorium ten·to·ri·um (těn-tôr'ē-əm)
n. pl. ten·to·ri·a (-tôr'ē-ə)
A membranous cover or horizontal partition.

The American Heritage® Stedman's Medical Dictionary
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