The Collaborative International Dictionary of English v.0.48:

Pancreas \Pan"cre*as\, n. [NL., fr. Gr. ?; pa^s, pa^n, all +
   kre`as flesh, meat: cf. F. pancr['e]as.] (Anat.)
   The sweetbread, a gland connected with the intestine of
   nearly all vertebrates. It is usually elongated and
   light-colored, and its secretion, called the pancreatic
   juice, is discharged, often together with the bile, into the
   upper part of the intestines, and is a powerful aid in
   digestion. See Illust. of Digestive apparatus.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pancreas
    n 1: a large elongated exocrine gland located behind the
         stomach; secretes pancreatic juice and insulin