6. (Horology)
Defn: spring to impel the star wheel, also a pawl to lock fast a wheel, in a repeating timepiece. Baby jumper. See in the Vocabulary. — Bounty jumper. See under Bounty.
JUMPER
Jump"er, n. Etym: [See 1st Jump.]
Defn: A loose upper garment; as: (a) A sort of blouse worn by workmen over their ordinary dress to protect it. (b) A fur garment worn in Arctic journeys.
JUMPING
Jump"ing, p. a. & vb. n.
Defn: 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 (Zoöl.), 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 (Zoöl.), any of the numerous species of plant lice belonging to the family Psyllidæ, several of which are injurious to fruit trees. — Jumping mouse (Zoöl.), 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 (Zoöl.), gray mullet. — Jumping shrew (Zoöl.), any African insectivore of the genus Macroscelides. They are allied to the shrews, but have large hind legs adapted for jumping. — Jumping spider (Zoöl.), spider of the genus Salticus and other related genera; one of the Saltigradæ; — so called because it leaps upon its prey.
JUMPING DISEASE
Jump"ing dis*ease".
Defn: A convulsive tic similar to or identical with miryachit, observed among the woodsmen of Maine.
JUMP SPARK
Jump spark.
Defn: A spark produced by the jumping of electricity across a permanent gap.