head|er «HEHD uhr», noun.
1. a person, tool, or machine that puts on or takes off heads, such as those of barrels, pins, or nails.
2. a harvesting machine that cuts off the heads of grain and puts them in a storage box or a wagon.
3. Informal. a plunge, dive, or fall headfirst: »
He slipped and took a header over the pool's edge.
4. a beam forming part of a framework around an opening of a floor or roof, placed so as to fit between two long beams and support the ends of the short ones.
5. a brick or stone laid with its length across the thickness of a wall.
6. the act of hitting the ball with the head in soccer: »
He scored the second goal with a perfect header (London Times).
7. Nautical. = head wind. (Cf. ↑head wind)
Useful english dictionary. 2012.