gastrolith (n.)

also gastero-, before vowels gastr-, scientific word-forming element meaning "stomach," from Greek gastro-, combining form of gaster (genitive gastros) "belly, paunch; womb" (see gastric). Also used in compounds in ancient Greek, as gastrobarys "heavy with child."

word-forming element meaning "stone, rock," from Modern Latin -lithus or French -lithe (see -lith).