| Baby jumper () A hoop suspended by an elastic strap, in which a young child may be held secure while amusing itself by jumping on the floor. |
| Bed rock () The solid rock underlying superficial formations. Also Fig. |
| Jumper (n.) One who, or that which, jumps. |
| Jumper (n.) A long drilling tool used by masons and quarrymen. |
| Jumper (n.) A rude kind of sleigh |
| Jumper (n.) The larva of the cheese fly. See Cheese fly, under Cheese. |
| Jumper (n.) A name applied in the 18th century to certain Calvinistic Methodists in Wales whose worship was characterized by violent convulsions. |
| Jumper (n.) spring to impel the star wheel, also a pawl to lock fast a wheel, in a repeating timepiece. |
| Jumper (n.) A loose upper garment |
| Jumper (n.) A sort of blouse worn by workmen over their ordinary dress to protect it. |
| Damaraland mole rat colonial mole rat of western Africa, similar to naked mole rat |