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[thahy-sis, tahy-] /ˈθaɪ sɪs, ˈtaɪ-/
noun, Pathology.
a wasting away.
pulmonary tuberculosis; consumption.
Origin of phthisis
1515-25; < Greek phthísis lung disease, literally, a wasting away, equivalent to phthí(ein) to decay + -sis -sis Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for phthisis


/ˈθaɪsɪs; ˈfθaɪ-; ˈtaɪ-/
any disease that causes wasting of the body, esp pulmonary tuberculosis
Word Origin
C16: via Latin from Greek: a wasting away, from phthinein to waste away
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for phthisis

1520s, from Late Latin phthisis "consumption," from Greek phthisis "wasting, consumption; perishing, decay; waxing," from phthiein "to decay, waste away," from PIE root *dhgwhei- "to perish, die away" (cf. Sanskrit ksitih "destruction," ksinati "perishes").

Online Etymology Dictionary, © 2010 Douglas Harper
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phthisis in Medicine

phthisis phthi·sis (thī'sĭs, tī'-) or phthis·ic (tĭz'ĭk, thĭz'-)

  1. A disease characterized by the wasting away or atrophy of the body or a part of the body.

  2. Tuberculosis of the lungs. No longer in technical use.

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