The Collaborative International Dictionary of English v.0.48:

Monotropaceae \Monotropaceae\ prop. n.
   A natural family of plants, used in some classifications for
   saprophytic herbs; it is sometimes included in the family
   Pyrolaceae, and contains the genera Monotropa and
   Sarcodes.

   Syn: family Monotropaceae.
        [WordNet 1.5] Monotype

WordNet (r) 3.0 (2006):

Monotropaceae
    n 1: used in some classification for saprophytic herbs sometimes
         included in the family Pyrolaceae: genera Monotropa and
         Sarcodes [syn: Monotropaceae, family Monotropaceae]