One of the mysteries of the English language finally explained.
A genus of mosses of the family Polytrichaceae, whose members have calyptrae covered with fine hairs; (also polytrichum) a moss of this genus, especially Polytrichum commune, the golden maidenhair or hair moss (also "polytrichum moss").
Mid 18th century; earliest use found in New & Complete Dictionary Arts & Science. From post-classical Latin Polytrichum, apparently from polytrichon, after Latin nouns in -um.
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