outboard

nouns

a motorboat with an outboard motor
outboard, outboard motorboat
internal-combustion engine that mounts at stern of small boat
outboard, outboard motor

adjectives

located away from the midline of a vessel or aircraft
"the outboard section of a wing"; "outboard rigging"
outboard
antonym
inboard
is similar to
of a motor designed to be attached to the outside of a boat's hull
"a portable outboard motor"
portable