The Collaborative International Dictionary of English v.0.48:

Trencher-man \Trench"er-man\, n.; pl. Trencher-men.
   [1913 Webster]
   1. A feeder; a great eater; a gormandizer. --Shak.
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   2. A cook. [Obs.]
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            The skillfulest trencher-men of Media. --Sir P.
                                                  Sidney.
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   3. A table companion; a trencher mate. --Thackeray.
      [1913 Webster]

WordNet (r) 3.0 (2006):

trencherman
    n 1: a person who is devoted to eating and drinking to excess
         [syn: glutton, gourmand, gourmandizer, trencherman]