Regulo® /regˈū-lō/

1. A thermostatic control system for gas ovens
2. Loosely (with a given numeral) one of the graded scale of temperatures on a gas oven (also without cap)

• four-oars
• four-o'clock
• four-pack
• four-packs
• four-part
• four-parted
• fourpence
• fourpences
• fourpennies
• fourpenny
• fourpenny one
• four-poster
• four-posters
• four-pounder
• four-pounders
• fours
• fourscore
• fourscorth
• four-seater
• four-seaters
• fourses
• foursome
• foursomes
• four-square
• four-stroke cycle