inboard-outboard

[ in-bawrd-out-bawrd, in-bohrd-out-bohrd ]

adjective

1. Also (of a motorboat) having an inboard engine connected to a maneuverable outboard drive-shaft unit.

noun

1. an inboard-outboard motor.
2. a boat equipped with such a motor. : I/O

Word History and Origins

Origin of inboard-outboard¹

First recorded in 1925–30