Allen screwAllen screw /ˈælən skruː/ noun [countable] 
a type of screw with a hole that has six sides
a type of screw with a hole that has six sides- secondment
- second name
- second person
- second-rate
- second screen
- second screener
- second screening
- second sight
- second-string
- Second World War
- secrecy
- secret
- secret agent
- secretarial
- Secretariat
- secretariat
- secretary
- secretary general
- Secretary of State
- secret ballot
- secrete
- secretion
- secretive
- secretively
- secretiveness