<p><strong>Noun</strong></p><ul><li>a wether or other male sheep that leads the flock, usually bearing a bell.</li><li>a person or thing that assumes the leadership or forefront, as of a profession or industry: Paris is a bellwether of the fashion industry.</li><li>a person or thing that shows the existence or direction of a trend; index.</li><li>a person who leads a mob, mutiny, conspiracy, or the like; ringleader.</li></ul>