扇形尾端
Fantail \Fan"tail`\ (f[a^]n"t[=a]l`), n. (Zool.) (a) A variety of the domestic pigeon, so called from the shape of the tail. (b) Any bird of the Australian genus {Rhipidura}, in which the tail is spread in the form of a fan during flight. They belong to the family of flycatchers.
fantail n : an overhang consisting of the fan-shaped part of the deck extending aft of the sternpost of a ship