[thahy-sis, tahy-]
noun Pathology.
a wasting away.
pulmonary tuberculosis; consumption.

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. 2014.
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World English Dictionary
phthisis (ˈθaɪsɪs, ˈfθaɪ-, ˈtaɪ-)
any disease that causes wasting of the body, esp pulmonary tuberculosis
[C16: via Latin from Greek: a wasting away, from phthinein to waste away]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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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