Webster's English Dictionary

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metonymy

me.ton.y.my \m*-'ta:n-*-me-\ n [L metonymia, fr. Gk meto-nymia, fr. meta- + 
   -o-nymi]a -onymy : a figure of speech consisting of the use of the name of 
   one thing for th at of another of which it is an attribute or with which it 
   is associated (as in "lands belonging to the crown")