Source : Webster's Revised Unabridged Dictionary (1913)

Adiantum \Ad`i*an"tum\, n. [L., fr. Gr. ?, maidenhair; 'a priv.
   + ? to wet.] (Bot.)
   A genus of ferns, the leaves of which shed water; maidenhair.
   Also, the black maidenhair, a species of spleenwort.

Source : WordNet®

Adiantum
     n : cosmopolitan genus of ferns: maidenhair ferns; in some
         classification systems placed in family Polypodiaceae or
         Adiantaceae [syn: {genus Adiantum}]