The Collaborative International Dictionary of English v.0.48:

Camomile \Cam"o*mile\, Chamomile \Cham"o*mile\
   (k[a^]m"[-o]*m[imac]l), n. [LL. camonilla, corrupted fr. Gr.
   chamai`mhlon, lit. earth apple, being so called from the
   smell of its flower. See Humble, and Melon.] (Bot.)
   A genus of herbs (Anthemis) of the Composite family. The
   common camomile, Anthemis nobilis, is used as a popular
   remedy. Its flowers have a strong and fragrant and a bitter,
   aromatic taste. They are tonic, febrifugal, and in large
   doses emetic, and the volatile oil is carminative.
   [1913 Webster]

WordNet (r) 3.0 (2006):

camomile
    n 1: Eurasian plant with apple-scented foliage and white-rayed
         flowers and feathery leaves used medicinally; in some
         classification systems placed in genus Anthemis [syn:
         chamomile, camomile, Chamaemelum nobilis, Anthemis
         nobilis]