Dictionary
weath•er•cock
Pronunciation: (we&thslash;'ur-kok"), [key]—
n.
1. a weather vane with the figure of a rooster on it.
2. (loosely) any weather vane.
3. a person who readily adopts the latest fads, opinions, etc.:
The count is the weathercock of the jet set. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.