Definition of inboard in US English:


adverb & adjective

  • 1Within a ship, aircraft, or vehicle.

    as adverb ‘the spray was coming inboard now’
    as adjective ‘the uncovered inboard engine’
    • ‘A new departure of the company is the stocking of inboard Yanmar and Mercruiser diesel engines.’
    • ‘Most Bertram 31s were powered by two 330-hp Mercury Marine inboard engines.’
    • ‘When changing the oil in two inboard engines and a generator requires a human being with the arms of an orangutan and the I.Q. of a genius, something is wrong.’
    • ‘Under an ongoing joint research program of the marine industry, engine manufacturers, the Coast Guard, EPA and California, catalyst technology has so far only been tested on freshwater sterndrive and inboard engines.’
    • ‘But Volvo's engineers wiped the slate clean and started with a blank sheet of paper in developing a new series of diesel sterndrive and inboard engines with just boating in mind.’
    • ‘But according to Mercury Marine, only about half the sterndrive and inboard engines its sells come equipped with EFI, largely due to cost.’
    • ‘We were lucky that in both cases neither the inboard or outboard engines hit the deer.’
    • ‘Cobalt boats, widely admired as the Steinways of the runabout class - roughly defined as trailerable craft with inboard motors - are built about as far from a lapping tide as is geographically possible in America.’
    • ‘Unfortunately, there was no inboard computer.’
    • ‘The boat was a small cabin cruiser with an inboard motor.’
    • ‘The speed is a result of their unusual design, and their horsepower - three 90-hp outboard motors (ship tenders have inboard engines and are not built for speed).’
    • ‘With 260-hp inboard engines and normally loaded, she will cruise comfortably and economically at 25 mph and reach a top speed of 35 mph.’
    • ‘The report says those who may have been exposed are personnel who worked in the inboard underwing and the engine/undercarriage zones of the aircraft.’
    • ‘But before the couple arrived in Northern California, life on the water meant an afternoon with an inboard motor and a pair of skis.’
    • ‘Rob reduced the thrust in the right inboard engine slightly.’
    • ‘With the exception of a one-year full warranty on base inboard engines sold by Marine Power, all engine makers offer ‘limited warranties’ on their products.’
    • ‘Marshall's price for a new, normally equipped Sanderling, with inboard engine and trailer, is well over $40,000.’
    • ‘Among the worst offences were falling asleep on duty, refusing to follow orders, or ‘unclean behaviour’ - such as relieving bodily functions inboard, rather than using the rudimentary toilet facilities.’
    • ‘Smoke starts trailing him from his right inboard engine.’
    • ‘While the engine pads are about 10 times more expensive than the thin single sheets, with this experience our team started believing they would be worth using under inboard engines.’
    1. 1.1 Toward the center of a ship, aircraft, or vehicle.
      as adverb ‘move the clew inboard along the boom’
      as adjective ‘the inboard ailerons on the wings were dead’
      • ‘The wheels moved backwards as the struts shortened up and then swung inboard, pulling clam shell covers with them.’
      • ‘By pulling a handle to the right of the seat bench, the centre seat squab folds away and the outer two squabs move inboard.’
      • ‘It is rotated outboard to the ‘on’ position and inboard to ‘off.’’
      • ‘A verbal exchange with the RHIB crew, other SUNC's and the man took place, and the child was then taken back inboard by the man, subsequently assisted by the boarding party.’
      • ‘Each dredge would then be tipped inboard and the scallops emptied by pulling a line over the emptying derrick from the base of the dredge.’
      • ‘And they pulled me inboard, and they put me right up in the bow, of the whaler, and they covered me with a tarpaulin or something.’
      • ‘We maneuvered alongside and got lines round it and heaved it inboard.’
      • ‘The skipper was at my side, a dip of the net and the fish was inboard.’
      • ‘The oars on the portside of the ship came up, and were hauled halfway inboard.’
      • ‘Columns are pulled inboard to create a circulation zone around the perimeter, and adjustable fabric baffles at the column line enable the room to be blacked out, acoustically dampened, and planned to simulate different stage layouts.’
      • ‘The door is well done and opens inboard, as it should, but I would prefer the builder offer this as an option and include more useful features for fisherman such as fish boxes, a saltwater wash down pump and rod holders as standard features.’


  • 1A boat's engine housed inside its hull.

    • ‘The engine is a Chrysler 318 V - 8 inboard with a straight shaft.’
    • ‘The four-stroke cylinders do not have this oil coating and will rust when not run for long periods, just like four-stroke inboards do.’
    • ‘The inboards also make a small difference, but they may be too expensive to be worth it, and may not even be available.’
    • ‘A variety of twin-engine options were offered on the Coastal 2800 over the nine years of production, including factory installed, 225-hp OMC Sea Drives and a variety of gasoline inboards, from 220 to 270 hp.’
    • ‘In the marina I can see two gleaming Sabrecraft, a 37-footer named Little Frégate and the slightly larger Frigate Bird, both with twin 350 hp inboards.’
    • ‘Today, multilevel, multi-year limited warranties are standard on almost all outboard engines and a growing number of inboards, according to a survey by BoatU.S. (See charts at right.)’
    • ‘Meanwhile, the state of California, through its powerful Air Resources Board, is moving toward requiring catalytic converters on marine sterndrives and inboards, ahead of the EPA.’
    1. 1.1 A boat with an inboard engine.
      • ‘The IPS props - which are smaller than a standard prop configuration - are also in perfect horizontal alignment with the boat's bottom, unlike inboards whose typical seven-degree down angle wastes energy.’
      • ‘Some 56% of the boats used most often had propeller propulsion and of those boats with motors, nearly 60% were outboards and 26.7% were inboards.’
      • ‘The Blue Fin is still in rotation, but a 405-horsepower inboard with a speedometer and a sound system is the family boat of choice.’