Merriam-Webster Collegiate Dictionary - skull

 I. noun  Etymology: Middle English ~e, of Scandinavian origin; akin to Swedish dialect ~e ~  Date: 13th century  1. the skeleton of the head of a vertebrate forming a bony or cartilaginous case that encloses and protects the brain and chief sense organs and supports the jaws  2. the seat of understanding or intelligence ; mind  • ~ed adjective  II. transitive verb  Date: 1945  1. to hit on the head  2. to unintentionally hit (a golf ball or shot) with the bottom edge of the clubface