The Collaborative International Dictionary of English v.0.48:

Albumen \Al*bu"men\, n. [L., fr. albus white.]
   1. The white of an egg.
      [1913 Webster]

   2. (Bot.) Nourishing matter stored up within the integuments
      of the seed in many plants, but not incorporated in the
      embryo. It is the floury part in corn, wheat, and like
      grains, the oily part in poppy seeds, the fleshy part in
      the cocoanut, etc.
      [1913 Webster]

   3. (Chem.) Same as Albumin.
      [1913 Webster]

WordNet (r) 3.0 (2006):

albumen
    n 1: a simple water-soluble protein found in many animal tissues
         and liquids [syn: albumin, albumen]
    2: the white part of an egg; the nutritive and protective
       gelatinous substance surrounding the yolk consisting mainly
       of albumin dissolved in water; "she separated the whites from
       the yolks of several eggs" [syn: egg white, white,
       albumen, ovalbumin]

Moby Thesaurus II by Grady Ward, 1.0:

56 Moby Thesaurus words for "albumen":
   batter, bonnyclabber, butter, caviar, clabber, cornstarch, cream,
   curd, dough, egg, egg white, eggshell, fish eggs, gaum, gel,
   gelatin, glair, glop, glue, gluten, goo, gook, goop, gruel, gumbo,
   gunk, jam, jell, jelly, loblolly, molasses, mucilage, mucus, ovule,
   pap, paste, porridge, pudding, pulp, puree, putty, rob, roe,
   semifluid, semiliquid, size, soup, spawn, starch, sticky mess,
   syrup, treacle, vitellus, white, yellow, yolk