1) Vane 2) Weather vane 3) Weathervane 4) Wind vane 1) Vane 
• (v. t.) To supply with a weathercock; to serve as a weathercock for. • (n.) Hence, any thing or person that turns easily and frequently; one who veers with every change of current opinion; a fickle, inconstant person. • (n.) A vane, or weather vane; -- so called because originally often in the figure of a cock, turning on the top o...
Weath'er·cock` noun 1. A vane, or weather vane; -- so called because originally often in the figure of a cock, turning on the top of a spire with the wind, and showing its direction. 'As a wedercok that turneth his face with every wind.' Chaucer. « Noisy weathercocks
[n] - weathervane with a vane in the form of a rooster
noun weathervane with a vane in the form of a rooster