outboard

/ˌaʊtˈbɔərd/

Other forms: outboards

Definitions of outboard

1. adjective

   located away from the midline of a vessel or aircraft
   “the outboard section of a wing”

   “outboard rigging”

   synonyms:

   portable

   of a motor designed to be attached to the outside of a boat's hull

   antonyms:

   inboard

   located within the hull or nearest the midline of a vessel or aircraft
2. noun

   internal-combustion engine that mounts at stern of small boat
   synonyms: outboard motor

   type of:

   ICE, internal-combustion engine

   a heat engine in which combustion occurs inside the engine rather than in a separate furnace; heat expands a gas that either moves a piston or turns a gas turbine
3. noun

   a motorboat with an outboard motor
   synonyms: outboard motorboat

   type of:

   motorboat, powerboat

   a boat propelled by an internal-combustion engine