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.
      [1913 Webster]

   2. A cook. [Obs.]
      [1913 Webster]

            The skillfulest trencher-men of Media. --Sir P.
                                                  Sidney.
      [1913 Webster]

   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]

Moby Thesaurus II by Grady Ward, 1.0:

54 Moby Thesaurus words for "trencherman":
   Brillat-Savarin, Lucullus, belly-god, board-and-roomer, boarder,
   bon vivant, cannibal, carnivore, connoisseur of food, consumer,
   cormorant, diner, diner-out, eater, eater-out, epicure, feeder,
   flesh-eater, fruitarian, gastronome, glutton, gorger, gormand,
   gormandizer, gourmand, gourmandizer, gourmet, grain-eater,
   graminivore, granivore, greedy eater, greedygut, greedyguts,
   guttler, herbivore, high liver, hog, hungry mouth, husky eater,
   lactovegetarian, luncher, man-eater, meat-eater, mouth, omnivore,
   omophagist, pantophagist, phytophage, picnicker, pig, plant-eater,
   predacean, trencherwoman, vegetarian