giant—noun

1. (in folklore) a being with human form but superhuman size, strength, etc.
2. a person or thing of unusually great size, power, importance, etc.; major figure; legend: a giant in her field; an intellectual giant.
3. (often initial capital letter) Classical Mythology.any of the Gigantes.
4. Mining..
5. Astronomy.giant star.

—adjective

6. unusually large, great, or strong; gigantic; huge.
7. greater or more eminent than others.

Origin: 1250–1300; Middle English geant < Old French < Latin gigant- (stem of gigās) < Greek Gígās; replacing Old English gigant < Latin, as above

—Related forms
gi·ant·like, adjective