1. (n.) One who, or that which, heads nails, rivets, etc., esp. a machine for heading.

2. (n.) One who heads a movement, a party, or a mob; head; chief; leader.

3. (n.) A brick or stone laid with its shorter face or head in the surface of the wall.

4. (n.) In framing, the piece of timber fitted between two trimmers, and supported by them, and carrying the ends of the tailpieces.

5. (n.) A reaper for wheat, that cuts off the heads only.

6. (n.) A fall or plunge headforemost, as while riding a bicycle, or in bathing; as, to take a header.

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