The front bowling pin in the triangular arrangement of ten pins

• Lane's number one
• First of an alley's 10
• One easily bowled over?
• It's denoted by a 1
• First thing usually hit by a bowling ball
• #1 on a lane
• It's placed midway between the gutters

WordNet Word definitions in WordNet
n. the front bowling pin in the triangular arrangement of ten pins [syn: kingpin ]

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
headpin \head"pin`\ (Bowling) n. The front pin in the triangular arrangement of ten pins. Syn: kingpin.