maidenhair
noun
maid·en·hair
| \ ˈmād-ᵊn-ˌha(ə)r, -ˌhe(ə)r
\
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Medical Definition of maidenhair
: any of the genus Adiantum of ferns including two North American forms (A. pedatum and the Venushair, A. capillus-veneris) that have been used in the preparation of expectorants and demulcents
— called also maidenhair fern