(Botanik, Bitkibilim) A genus of ferns (family Polypodiaceae) with delicate palmately branched fronds comprising the maidenhair ferns and including two No. American forms (A. pedatum and the Venushair A. capillus-veneris) that have been used in the preparation of expectorants and demulcents
cosmopolitan genus of ferns: maidenhair ferns; in some classification systems placed in family Polypodiaceae or Adiantaceae