The Collaborative International Dictionary of English v.0.48:

Chimonanthus \Chimonanthus\ n.
   a small genus of Asian deciduous or evergreen shrubs having
   fragrant flowers: winter sweet.

   Syn: genus Chimonanthus.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Chimonanthus
    n 1: small genus of Asian deciduous or evergreen shrubs having
         fragrant flowers: winter sweet [syn: Chimonanthus, genus
         Chimonanthus]