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thecal sac

[thee-kuh l sak] /ˈθi kəl ˈsæk/
noun, Anatomy.
1.
the loose membrane covering the spinal cord and containing cerebrospinal fluid; the spinal theca.
Origin of thecal sac
1910-1915
First recorded in 1910-15
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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