The Collaborative International Dictionary of English v.0.48:

Coke \Coke\, n. [Perh. akin to cake, n.]
   Mineral coal charred, or depriver of its bitumen, sulphur, or
   other volatile matter by roasting in a kiln or oven, or by
   distillation, as in gas works. It is lagerly used where ?
   smokeless fire is required. [Written also coak.]
   [1913 Webster]

   Gas coke, the coke formed in gas retorts, as distinguished
      from that made in ovens.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Coke \Coke\, v. t.
   To convert into coke.
   [1913 Webster]

WordNet (r) 3.0 (2006):

coke
    n 1: carbon fuel produced by distillation of coal
    2: Coca Cola is a trademarked cola [syn: Coca Cola, Coke]
    3: street names for cocaine [syn: coke, blow, nose candy,
       snow, C]
    v 1: become coke; "petroleum oils coke after distillation"