Webster's English Dictionary

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trombone

trom.bone \tra:m-'bo-n, (.)tr*m-', 'tra:m-.\ \-*st\ n [It, aug. of tromba 
   trumpet, of Gmc origin; akin to OHG trumba, ]trumpa trumpet : a brass wind 
   instrument that has a cupped mouthpiece, that consists of a  long 
   cylindrical metal tube bent twice upon itself and ending in a bell and that 
   has a movable slide with which to vary the pitch - trom.bon.ist n