Definition of mountain mahogany in English:

mountain mahogany

noun

US
  • 1The sweet birch, Betula lenta.

  • 2Any of various shrubs of the genus Cercocarpus (family Rosaceae), noted for their red wood and long-tailed fruits; especially C. ledifolius, of western North America.

Origin

Early 19th century; earliest use found in François André Michaux (1770–1855).