2 definitions found From WordNet (r) 2.0 [wn]: Adiantum noun: cosmopolitan genus of ferns: maidenhair ferns; in some classification systems placed in family Polypodiaceae or Adiantaceae [syn: {genus Adiantum}] From The Collaborative International Dictionary of English v.0.44 [gcide]: Adiantum \Ad'i*an"tum\, noun [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.

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