ˈ ̷ ̷ˌ ̷ ̷ noun
1. : a disk fixed with its face at right angles to the live spindle of a lathe and provided with holes, slots, and other devices for the attachment of the work which thus rotates with the spindle
2.
a. : a protective plate for a machine or device (as a door lock)
b. : a protective covering for the human face (as of a diver)