Definition of Mnium in US English:

Mnium

noun

  • A genus of mosses of the family Mniaceae (order Bryales), whose members have broad, sometimes reddish leaves and often drooping capsules, and are found throughout much of the northern hemisphere; (also mnium) a moss of this genus.

Origin

Mid 18th century; earliest use found in New & Complete Dictionary Arts & Science. From post-classical Latin Mnium (J. J. Dillenius Historia Muscorum 232) from Hellenistic Greek μνίον seaweed, of unknown origin.