Trailer

n.
  1. a wheeled vehicle without a motor, designed to be drawn by a motor vehicle in front of it;
  2. (Movies) A short blank segment of movie film attached to the end; -- used for convenient insertion of the film in a projector.
  3. (Movies) A short film consisting primarily of one or more short portions of a film, used in promotions or advertisements shortly before initial release of a film.
  4. A part of an object which extends some distance beyond the main body of the object; as, the trailer of a plant.
    1. such a vehicle used on street railroads. Called also trail car.
    2. the large wheeled wagon or van pulled by a tractor in a tractor-trailer combination.
    3. a vehicle equipped as a mobile dwelling unit, pulled by an automobile or other mtor vehicle, and used as a dwelling when parked; -- also called a mobile home.
    4. A wheeled motorless open wagon designed to carry a heavy object, such as a boat trailer.
    trailer park .
    An area equipped to accommodate trailers{2}, often with outlets supplying electrical power and water. Called also trailer camp, trailer court.