The Collaborative International Dictionary of English v.0.48:
Danaidae \Danaidae\ n. a small natural family of usually tropical butterflies, including the monarch butterflies. Syn: family Danaidae. [WordNet 1.5]WordNet (r) 3.0 (2006):
Danaidae n 1: small family of usually tropical butterflies: monarch butterflies [syn: Danaidae, family Danaidae]