The Collaborative International Dictionary of English v.0.48:

Chef \Chef\, n. [F.]
   1. A chief or head person.
      [1913 Webster]

   2. The head cook of large establishment, as a club, a family,
      etc.
      [1913 Webster]

   3. (Her.) Same as Chief.
      [1913 Webster]

WordNet (r) 3.0 (2006):

chef
    n 1: a professional cook

Moby Thesaurus II by Grady Ward, 1.0:

38 Moby Thesaurus words for "chef":
   baker, boss, bwana, chef de cuisine, chief, chief cook,
   church dignitary, cook, culinarian, culinary artist, ecclesiarch,
   elder, employer, fry cook, goodman, guru, husband, kitchener,
   liege, liege lord, lord, lord paramount, master, overlord, padrone,
   paramount, pastry chef, pastrycook, paterfamilias, patriarch,
   patron, rabbi, sahib, seigneur, seignior, short-order cook,
   starets, teacher