Home › Words › G › gigantomastiagigantomastiagigantomastia means an extreme form of macromastia, usually with more than 2.5 kilograms of excess tissue.EtymologyFrom giganto- (“gigantic”) + -mastia (“abnormality of the breast”), from Ancient Greek γιγαντικός (gigantikós), ultimately from γίγας (gígas, “giant”), and μαστός (mastós, “breast”).nounAn extreme form of macromastia, usually with more than 2.5 kilograms of excess tissue.Definitions & examples from Wiktionary (CC BY-SA 3.0).