Rockaway \Rock"a*way\, [Probably from Rockaway beach, where it was used.]

Formerly, a light, low, four-wheeled carriage, with standing top, open at the sides, but having waterproof curtains which could be let down when occasion required; now, a somewhat similar, but heavier, carriage, inclosed, except in front, and having a door at each side.

Source: Webster's Revised Unabridged Dictionary (1913)