Webster's English Dictionary

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tusk

1. tusk \'t*sk\ \'t*skt\ \'t*s-.kli-k\ n [ME, alter. of tux, fr. OE tu-x; 
   akin to OE tu-sc tush] 1: an elongated greatly enlarged tooth that projects 
   when the mouth is clos ed and serves for digging food or as a weapon; 
   broadly : a long protruding tooth 2: one of the small projections on a tusk 
   tenon  - tusked aj
2. tusk vt : to dig up with a tusk; also : to gash with a tusk