The Collaborative International Dictionary of English v.0.48:

Gelatinous \Ge*lat"i*nous\, a. [Cf. F. g['e]latineux.]
   Of the nature and consistence of gelatin or the jelly;
   resembling jelly; viscous.
   [1913 Webster]

WordNet (r) 3.0 (2006):

gelatinous
    adj 1: thick like gelatin [syn: gelatinous, gelatinlike,
           jellylike]

Moby Thesaurus II by Grady Ward, 1.0:

48 Moby Thesaurus words for "gelatinous":
   adhesive, amylaceous, clabbered, clammy, clotted, coagulated,
   curdled, doughy, gaumy, glairy, gluelike, gluey, glutenous,
   glutinose, glutinous, gooey, grumous, gumbo, gumbolike, gumlike,
   gummous, gummy, heavy, inspissated, jelled, jellied, jellylike,
   mucilaginous, pasty, ropy, slabby, slimy, slithery, starchy,
   sticky, stodgy, stringy, syrupy, tacky, tenacious, thick,
   thickened, tough, tremelloid, tremellose, viscid, viscose,
   viscous