noun Pathology.
the formation or presence of stony concretions, as calculi, in the body.

1650–60; < Neo-Latin < Greek lithíāsis; see lith-, -iasis Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lithiasis (lɪˈθaɪəsɪs)
pathol the formation of a calculus
[C17: New Latin; see litho-, -iasis]

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

lithiasis li·thi·a·sis (lĭ-thī'ə-sĭs)
n. pl. li·thi·a·ses (-sēz')
The formation of calculi of any kind, especially biliary or urinary calculi.

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