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thecal sac

American  
[thee-kuhl sak] / ˈθi kəl ˈsæk /

noun

Anatomy.

  1. the loose membrane covering the spinal cord and containing cerebrospinal fluid; the spinal theca.

Etymology

Origin of thecal sac

First recorded in 1910–15

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.