Webster's English Dictionary

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oak

oak \'o-k\ n or oaks or oak [ME ook, fr. OE a-c; akin to OHG eih oak, Gk 
   aigilo-] pl  often attrib ps, a kind of oak 1: a tree or shrub (genera 
   Quercus or Lithocarpus) of the beech  family 2a: the tough hard durable 
   wood of an oak tree  2b: the leaves of an oak used as decoration