Fantail

noun

1. Any of several birds, of the genus Rhipidura, from Asia, Australia and New Zealand.
2. Any of several domestic varieties of pigeon having a fan-shaped tail.
3. Any of several goldfish having a large fan-shaped tail.
4. An overhanging deck at the stern of a ship
5. A small windmill mounted at right angles to the sails, at the rear of the windmill, used to turn the cap automatically to bring it into the wind.