/ Dictionary / Index L lithiasis: Meaning and Definition of Find definitions for: li•thi•a•sis Pronunciation: (li-thī'u-sis), [key] — n. Pathol. the formation or presence of stony concretions, as calculi, in the body. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lithiasis (Thesaurus) lithia lithia water Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language