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Of or relating to the family Monotropaceae of saprophytic (mycotrophic) plants, of which Monotropa is the type genus.
The family Monotropaceae is now regarded by most botanists as a subfamily (Monotropoideae) of the family Ericaceae.
Late 19th century; earliest use found in Isaac Funk (1839–1912), publisher and reformer. From scientific Latin Monotropaceae, family name + -ous.