LITHIASIS
lithiasis
(noun) the formation of stones (calculi) in an internal organ
Source: WordNet® 3.1
Etymology
Noun
lithiasis (plural lithiases)
(medicine) The process of forming stone-like deposits or calculi formed in an internal organ, such as a gallstone in the gall bladder.
Source: Wiktionary
Li*thi"a*sis, n. Etym: [NL., fr. Gr. (Med.)
Definition: The formation of stony concretions or calculi in any part of
the body, especially in the bladder and urinary passages. Dunglison.
Source: Webster’s Unabridged Dictionary 1913 Edition