Etymology
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outboard (adj.)

also out-board, "situated on the outside of a ship," 1823, from out- + board (n.2). In reference to motors, from 1909.

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Definitions of outboard
1
outboard (n.)
a motorboat with an outboard motor;
Synonyms: outboard motorboat
outboard (n.)
internal-combustion engine that mounts at stern of small boat;
Synonyms: outboard motor
2
outboard (adj.)
located away from the midline of a vessel or aircraft;
outboard rigging
the outboard section of a wing
From wordnet.princeton.edu