Elephantiac

a. [ L. elephantinus of ivory, Gr. &unr_;: cf. F. éléphantin. ] Pertaining to the elephant, or resembling an elephant (commonly, in size); hence, huge; immense; heavy; as, of elephantine proportions; an elephantine step or tread. [ 1913 Webster ]

Elephantine epoch (Geol.), the epoch distinguished by the existence of large pachyderms. Mantell. --
Elephantine tortoise (Zoöl.), a huge land tortoise; esp., Testudo elephantina, from islands in the Indian Ocean; and T. elephantopus, from the Galapagos Islands.