Source : Webster's Revised Unabridged Dictionary (1913)

Jumping \Jump"ing\, p. a. & vb. n.
   of {Jump}, to leap.

   {Jumping bean}, a seed of a Mexican {Euphorbia}, containing
      the larva of a moth ({Carpocapsa saltitans}). The larva by
      its sudden movements causes the seed to roll to roll and
      jump about.

   {Jumping deer} (Zo["o]l.), a South African rodent ({Pedetes
      Caffer}), allied to the jerboa.

   {Jumping jack}, a toy figure of a man, jointed and made to
      jump or dance by means of strings.

   {Jumping louse} (Zo["o]l.), any of the numerous species of
      plant lice belonging to the family {Psyllid[ae]}, several
      of which are injurious to fruit trees.

   {Jumping mouse} (Zo["o]l.), North American mouse ({Zapus
      Hudsonius}), having a long tail and large hind legs. It is
      noted for its jumping powers. Called also {kangaroo
      mouse}.

   {Jumping mullet} (Zo["o]l.), gray mullet.

   {Jumping shrew} (Zo["o]l.), any African insectivore of the
      genus {Macroscelides}. They are allied to the shrews, but
      have large hind legs adapted for jumping.

   {Jumping spider} (Zo["o]l.), spider of the genus {Salticus}
      and other related genera; one of the Saltigrad[ae]; -- so
      called because it leaps upon its prey.

Source : WordNet®

jumping bean
     n : seed of Mexican shrubs of the genus Sebastiana containing
         the larva of a moth whose movements cause the bean to
         jerk or tumble [syn: {jumping seed}, {Mexican jumping
         bean}]