[klaw-struhm, klou-]
noun, plural claustra [klaw-struh, klou-] . Anatomy.

1840–50; < Neo-Latin; Latin: bolt, barrier, equivalent to claud(ere) to close, shut + -trum instrumental suffix; cf. cloister Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

claustrum claus·trum (klô'strəm)
n. pl. claus·tra (-trə)
Any of several anatomical structures resembling a barrier, especially a thin vertical lamina of gray matter of the brain lying close to the outer portion of the lenticular nucleus, from which it is separated by the external capsule.

claus'tral adj.
The American Heritage® Stedman's Medical Dictionary
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