hopper

noun

a person or thing that hops
any hopping insect, esp. a grasshopper
a box, tank, rail car, etc., often funnel-shaped, from which the contents can be emptied slowly and evenly: the hopper of an automatic coal stoker
☆ a freight car with a bottom that opens to unload freight
in full hopper car
a box into which legislative bills are dropped for introduction, assignment to committees, etc.: often used figuratively

Hopper, Edward 1882-1967; U.S. painter

See hopper in American Heritage Dictionary 4