Learn how to say Mandolins correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word mandolin:
a plucked stringed instrument related to the lute, having four pairs of strings tuned in ascending fifths stretched over a small light body with a fretted fingerboard. It is usually played with a plectrum, long notes being sustained by the tremolo
a vegetable slicer consisting of a flat stainless-steel frame with adjustable cutting blades