The Collaborative International Dictionary of English v.0.48:

Jam \Jam\, n. [Prob. fr. jam, v.; but cf. also Ar. jamad ice,
   jelly, j[=a]mid congealed, jamd congelation, ice.]
   A preserve of fruit boiled with sugar and water; also called
   jelly; as, raspberry jam; currant jam; grape jam.
   [1913 Webster]

   Jam nut. See Check nut, under Check.

   Jam weld (Forging), a butt weld. See under Butt.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Jelly \Jel"ly\, v. i. [imp. & p. p. Jellied; p. pr. & vb. n.
   Jellying.]
   To become jelly; to come to the state or consistency of
   jelly.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

jelly \jel"ly\, n.; pl. Jellies. [ Formerly gelly, gely, F.
   gel['e]e jelly, frost, fr. geler to freeze. L. gelare; akin
   to gelu frost. See Gelid.]
   [1913 Webster]
   1. Anything brought to a gelatinous condition; a viscous,
      translucent substance in a condition between liquid and
      solid; a stiffened solution of gelatin, gum, or the like.
      [1913 Webster]

   2. The juice of fruits or meats boiled with sugar to an
      elastic consistence; as, currant jelly; calf's-foot jelly.
      [1913 Webster]

   Jelly bag, a bag through which the material for jelly is
      strained.

   Jelly mold, a mold for forming jelly in ornamental shapes.


   Jelly plant (Bot.), Australian name of an edible seaweed
      (Eucheuma speciosum), from which an excellent jelly is
      made. --J. Smith.

   Jelly powder, an explosive, composed of nitroglycerin and
      collodion cotton; -- so called from its resemblance to
      calf's-foot jelly.
      [1913 Webster]

WordNet (r) 3.0 (2006):

jelly
    n 1: an edible jelly (sweet or pungent) made with gelatin and
         used as a dessert or salad base or a coating for foods
         [syn: gelatin, jelly]
    2: a preserve made of the jelled juice of fruit
    3: any substance having the consistency of jelly or gelatin
    v 1: make into jelly; "jellify a liquid" [syn: jellify,
         jelly]

Moby Thesaurus II by Grady Ward, 1.0:

94 Moby Thesaurus words for "jelly":
   Jell-O, albumen, batter, beat up, blancmange, bonnyclabber, butter,
   cake, candy, churn, clabber, clot, clump, cluster, coagulate,
   colloid, colloidize, comfit, compote, concrete, confection,
   confectionery, confiture, congeal, conserve, cornstarch, cream,
   curd, curdle, dough, egg white, emulsify, emulsionize, frosting,
   gaum, gel, gelatin, gelatinate, gelatinize, glair, glaze, glop,
   glue, gluten, goo, gook, goop, gruel, gumbo, gunk, honey, icing,
   incrassate, inspissate, jam, jell, jellify, knot, loblolly, lopper,
   lump, marmalade, meringue, molasses, mousse, mucilage, mucus, pap,
   paste, porridge, preserve, pudding, pulp, puree, putty, rob,
   semifluid, semiliquid, set, size, soup, starch, sticky mess, sweet,
   sweet stuff, sweetmeat, sweets, syrup, thick, thicken, treacle,
   tutti-frutti, whip, whipped cream