lithiasis
noun
li·thi·a·sis li-ˈthī-ə-səs 
plural lithiases li-ˈthī-ə-ˌsēz
: the formation of stony concretions in the body (as in the gallbladder)
Word History
Etymology
borrowed from Late Latin lithiāsis "presence of calculi in the urinary tract or gall bladder," borrowed from Greek lithíāsis, from lithiā-, variant stem of lithiáō, lithiân "to suffer from calculi" (derivative of líthos "stone, rock," of obscure origin) + -sis -sis
First Known Use
circa 1657, in the meaning defined above
Medical Definition
lithiasis
noun
li·thi·a·sis lith-ˈī-ə-səs
plural lithiases -ˌsēz
: the formation of stony concretions in the body (as in the urinary tract or gallbladder) —often used in combination
cholelithiasis