The Collaborative International Dictionary of English v.0.48:
Danaus \Danaus\ n. the type genus of the Danaidae, including the monarch butterfly, Danaus plexippus. Syn: genus Danaus. [WordNet 1.5]WordNet (r) 3.0 (2006):
Danaus n 1: type genus of the Danaidae: monarch butterflies [syn: Danaus, genus Danaus]