Word Origin & History

c.1400, "density, thickness, compactness," from L. spissitudo, from spissus "thick, dense, compact, close" (cf. It. spesso, Sp. espeso, O.Fr. espes, Fr. épais).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

spissitude spis·si·tude (spĭs'ĭ-tōōd', -tyōōd')
The condition of a fluid thickened almost to a solid by inspissation.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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