WordNet (r) 3.0 (2006):

preprandial
    adj 1: preceding a meal (especially dinner); "a preprandial
           drink" [ant: postprandial]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "preprandial":
   cannibal, cannibalistic, carnivorous, commensal, dietetic, dining,
   eating, feeding, flesh-eating, fruitarian, gastronomic, gluttonous,
   grain-eating, graminivorous, granivorous, grass-eating,
   herbivorous, insect-eating, insectivorous, lactovegetarian,
   man-eating, meat-eating, mensal, nourishing, nutritious,
   omnivorous, omophagous, pantophagous, phytivorous, phytophagous,
   plant-eating, postprandial, prandial, predacious, vegetable-eating,
   vegetarian