gigant(o)-

Great size or extent.

Greek gigas, gigant‑, giant.

Gigantism is excessive growth due to hormonal imbalance; something gigantesque is befitting or suggestive of a giant; Gigantopithecus (Greek pithēkos, ape) is a very large fossil Asian ape of the Upper Miocene to Lower Pleistocene epochs; in Greek mythology, gigantomachy (Greek makhia, fighting) was the struggle between the gods and the giants.