The Collaborative International Dictionary of English v.0.48:
on-street \on-street\ adj. at the sides of streets; as, on-street parking is prohibited at rush hour. Opposite of off-street. [WordNet 1.5]WordNet (r) 3.0 (2006):
on-street adj 1: at the sides of streets; "on-street parking is prohibited at rush hour" [ant: off-street]