/pop"it/ , n.
1. Also called poppet valve . Mach. a rising and falling valve consisting of a disk at the end of a vertically set stem, used in internal-combustion and steam engines.
2. Brit. Dial. a term of endearment for a girl or child.
3. Naut. any of the vertical timbers bracing the bow or stern of a vessel about to be launched.
4. poppit.
5. poppethead.
[ 1300-50; ME; earlier form of PUPPET ]