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Latin word claustrum comes from Latin claudere, Latin -trum (Forming instrument nouns.)
claudere (Latin)
-trum (Latin)
Forming instrument nouns.
claustrum (Latin)
(Medieval Latin) portion of monastery closed off to laity. (New Latin, neuroanatomy) claustrum (thin lamina of grey matter in each cerebral hemisphere of the human brain). (rare, usually plural) a bar, band, bolt. Cloister (especially in plural). Enclosure (confined space). Gate, door, bulwark.