The Collaborative International Dictionary of English v.0.48:
eucalypt \eucalypt\ n. a tree of the genus Eucalyptus. Syn: eucalyptus, eucalyptus tree, gum tree. [WordNet 1.5]WordNet (r) 3.0 (2006):
eucalypt n 1: a tree of the genus Eucalyptus [syn: eucalyptus, eucalypt, eucalyptus tree]