Definition of "tusker"

The massive tusker leading the herd stopped in his tracks. His ears went out, his long sinuous trunk up.

1928 June, Fred Graves, “Houdini of the Desert: Face to Face with Savage Elephants”, in Popular Science, page 19

Negotiations to acquire a fine tusker from one young partner in another village fell through; so on the eve of the actual feast, Songi humiliated him by asking him to come to the feast as if he were the rival chief, the guest of honor. The man was deeply shamed by the invitation since he could not possibly reciprocate, and he had to send the tusker itself as payment for the invitation gifts.

1998, Alexander Moore, Cultural Anthropology: The Field Study of Human Beings‎, page 267