Source : Webster's Revised Unabridged Dictionary (1913)

Merino \Me*ri"no\, a. [Sp. merino moving from pasture to
   pasture, fr. merino a royal judge and superintendent or
   inspector of sheep walks, LL. merinus, fr. majorinus, i. e.,
   major vill?, fr. L. major greater. See {Major}. Merino sheep
   are driven at certain seasons from one part of Spain to
   another, in large flocks, for pasturage.]
   1. Of or pertaining to a variety of sheep with very fine
      wool, originally bred in Spain.

   2. Made of the wool of the merino sheep.

Merino \Me*ri"no\, n.; pl. {Merinos}. [Sp.]
   1. (Zo["o]l.) A breed of sheep originally from Spain, noted
      for the fineness of its wool.

   2. A fine fabric of merino wool.

Source : WordNet®

merino
     n : white sheep originating in Spain and producing a heavy
         fleece of exceptional quality [syn: {merino sheep}]