(noun) a motorboat with an outboard motor. Synonyms: outboard motorboat.
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Noun Definition 1
(noun) internal-combustion engine that mounts at stern of small boat. Synonyms: outboard motor.
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Noun Definition 2
(adj) located away from the midline of a vessel or aircraft. Synonyms: outboard (vs. inboard). Examples: "The outboard section of a wing." "Outboard rigging."