Source : Webster's Revised Unabridged Dictionary (1913)

Muscovado \Mus`co*va"do\, a. [Corrupted fr. Sp. mascabado; cf.
   Pg. mascavado, F. moscouade, n., formerly also mascovade, It.
   mascavato.]
   Pertaining to, or of the nature of, unrefined or raw sugar,
   obtained from the juice of the sugar cane by evaporating and
   draining off the molasses. Muscovado sugar contains
   impurities which render it dark colored and moist.

Muscovado \Mus`co*va"do\, n.
   Unrefined or raw sugar.