Definition of sleeper

• n. - One who sleeps; a slumberer; hence, a drone, or lazy person.
• n. - That which lies dormant, as a law.
• n. - A sleeping car.
• n. - An animal that hibernates, as the bear.
• n. - A large fresh-water gobioid fish (Eleotris dormatrix).
• n. - A nurse shark. See under Nurse.
• n. - Something lying in a reclining posture or position.
• n. - One of the pieces of timber, stone, or iron, on or near the level of the ground, for the support of some superstructure, to steady framework, to keep in place the rails of a railway, etc.; a stringpiece.
• n. - One of the joists, or roughly shaped timbers, laid directly upon the ground, to receive the flooring of the ground story.
• n. - One of the knees which connect the transoms to the after timbers on the ship's quarter.
• n. - The lowest, or bottom, tier of casks.