The Collaborative International Dictionary of English v.0.48:

Moros \Mo"ros\, n. pl.; sing. Moro. [Sp., pl. of Moro Moor.]
   (Ethnol.)
   The Mohammedan tribes of the southern Philippine Islands,
   said to have formerly migrated from Borneo. Some of them are
   warlike and addicted to piracy.
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Moro \Mo"ro\ (m[=o]"r[-o]), prop. n.; pl. Moros
   (m[=o]"r[-o]s). [Sp., moor. See moor, n. and Moros.]
   1. (Ethnol.) A member of any of the Moros, a group one of
      various tribes of the southern Phillippine Islands, mostly
      Malays adhering to Mohammedanism.
      [PJC]

   2. (Linguistics) Any of the languages of the Moro people, of
      the Austronesian language family.
      [PJC]