Webster's English Dictionary

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cork

1. cork \'ko.(*)rk\ n [ME, cork, bark, prob. fr. Ar qurq, fr. L cortic-, 
   cortex] 1a: the elastic tough outer tissue of a European oak (Quercus 
   suber)  used esp. for stoppers and insulation 1b: PHELLEM  2: a usu. cork 
   stopper for a bottle or jug  3: an angling float 
2. cork vt 1: to furnish or fit with cork or a cork  2: to blacken with 
   burnt cork