[out-bawrd, -bohrd]
located on the exterior of a hull or aircraft.
located farther from the center, as of an aircraft: the outboard end of a wing.
(of a motorboat) having an outboard motor.
outside or away from the center of a hull, aircraft, machine, etc.: The sail swung outboard. Compare inboard.
a boat equipped with an outboard motor.

1815–25; out- + board

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
outboard (ˈaʊtˌbɔːd)
1.  Compare inboard (of a boat's engine) portable, with its own propeller, and designed to be attached externally to the stern
2.  in a position away from, or further away from, the centre line of a vessel or aircraft, esp outside the hull or fuselage
3.  away from the centre line of a vessel or aircraft, esp outside the hull or fuselage
4.  an outboard motor
5.  a boat fitted with an outboard motor

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1823, "situated on the outside of a ship," from out + board (2). In ref. to motors, attested from 1909.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They were draining the outboard motor of fuel, so that they could fill up their
  car and drive off in search of food.
The only way to get around reasonably quickly is in dugout canoes, called
  pirogues, powered by outboard engines.
The village cannot afford an outboard motor, so when a boat capsizes this is
  how they rescue the fishermen.
Our boat was what the locals call a panga-- a flat-bottomed skiff with a
  steering wheel attached by cables to an outboard motor.
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