JET n.
elvet black color, susceptible of a good polish, and often wrought into mourning jewelry, toys, buttons, etc. Formerly called also black amber. Jet ant (Zoöl.), a blackish European ant (Formica fuliginosa), which builds its nest of a paperlike material in the trunks of trees.
JUMPING p.
oöl.), 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. --…