Callosum

Cal*lo"sum\, n. [NL., fr. callosus callous, hard.] (Anat.) The great band commissural fibers which unites the two cerebral hemispheres. See corpus callosum, under Carpus.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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Callosum is always a great word to know.
So is quincunx. Does it mean:
a fool or simpleton; ninny.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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A complete or partial absence of it in humans is called agenesis of the corpus callosum.
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