'headpin' definitions:

Definition of 'headpin'

(from WordNet)
noun
The front bowling pin in the triangular arrangement of ten pins [syn: headpin, kingpin]

Definition of 'headpin'

From: GCIDE
  • headpin \head"pin`\ (Bowling) n. The front pin in the triangular arrangement of ten pins.
  • Syn: kingpin. [WordNet 1.5]