minibu

n. [ L. minor less + -bus, as in omnibus. ] 1. A kind of light passenger vehicle, carrying four persons. [ archaic ] [ 1913 Webster ]

2. A type of bus (omnibus) similar in general appearnace to a standard-sized bus, but smaller and having a smaller passenger capacity, typically about 15 persons. It is usually used for transportation over relatively short distances. [ PJC ]