Source : Webster's Revised Unabridged Dictionary (1913)

Marimba \Ma*rim"ba\, n. [Pg.]
   A musical istrument of percussion, consisting of bars
   yielding musical tones when struck. --Knight.

Source : WordNet®

marimba
     n : a percussion instrument with wooden bars tuned to produce a
         chromatic scale and with resonators; played with small
         mallets [syn: {xylophone}]