inboard-outboard

[in-bawrd-out-bawrd, in-bohrd-out-bohrd]
noun Also called outdrive, stern drive.
  1. an inboard-outboard motor.
  2. a boat equipped with such a motor. Abbreviation: I/O
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018