Definition: claustral

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Source: Webster's Revised Unabridged Dictionary (1913) 

Claustral \Claus"tral\, a. [F., fr. LL. claustralis, fr. L.
   claustrum. See Cloister.]
   Cloistral. --Ayliffe
Claustrum \Claus"trum\, n.; pl. Claustra. [L., a bolt or bar.]
   (Anat.)
   A thin lamina of gray matter in each cerebral hemisphere of
   the brain of man. -- Claus"tral, a.