Origin: Germanic Old English prefix
Outboard has 5 different meanings across 2 categories:
a motorboat with an outboard motor
"We rented an outboard for our lake trip because its small engine is perfect for calm waters."
internal-combustion engine that mounts at stern of small boat
"After the fuel pump failed, I had to manually push the outboard motor toward the center of the boat before it would start."
An outboard motor.
"He adjusted the tilt on his boat's outboard to get a better angle for fishing."
located away from the midline of a vessel or aircraft
"the outboard section of a wing"
"outboard rigging"
Situated outside the hull of a vessel.
"The fisherman quickly secured the outboard motor to the stern before launching his small boat into the choppy waters."