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inboard-outboard

[in-bawrd-out-bawrd, in-bohrd-out-bohrd]
adjective
  1. Also outdrive, stern-drive. (of a motorboat) having an inboard engine connected to a maneuverable outboard drive-shaft unit.
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noun Also called outdrive, stern drive.
  1. an inboard-outboard motor.
  2. a boat equipped with such a motor. Abbreviation: I/O
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018