man·do·lin 
(măn′də-lĭn, măndl-ĭn)
(măn′də-lĭn, măndl-ĭn)n.
A small lutelike instrument with a typically pear-shaped body and a straight fretted neck, having usually four sets of paired strings tuned in unison or octaves.
[French mandoline, from Italian mandolino, diminutive of mandola, lute, from French mandore, from Late Latin pandūra, three-string lute, from Greek pandoura, perhaps of Mesopotamian origin.]
man′do·linist n.
mandolin