snare definition

1. a small drum with two heads and a snare stretched across the lower head
2. a surgical instrument consisting of wire hoop that can be drawn tight around the base of polyps or small tumors to sever them; used especially in body cavities
3. strings stretched across the lower head of a snare drum; they make a rattling sound when the drum is hit
4. a trap for birds or small mammals; often has a slip noose