The Collaborative International Dictionary of English v.0.48:

Pottage \Pot"tage\ (?; 48), n. [F. potage, fr. pot pot. See
   Pot, and cf. Porridge, Porringer.]
   A kind of food made by boiling vegetables or meat, or both
   together, in water, until soft; a thick soup or porridge.
   [Written also potage.] --Chaucer.
   [1913 Webster]

         Then Jacob gave Esau bread and pottage of lentils.
                                                  --Gen. xxv.
                                                  34.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pottage
    n 1: a stew of vegetables and (sometimes) meat
    2: thick (often creamy) soup [syn: potage, pottage]

Easton's 1897 Bible Dictionary:

Pottage
   Heb. nazid, "boiled", a dish of boiled food, as of lentils (Gen.
   25:29; 2 Kings 4:38).