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]