locking stone
noun
1 Clockmaking and Watchmaking a locking pallet in the form of a ruby or other jewel.
2= keystone.
Origin
Mid 19th century.
- horseback rider
- horseback riding
- horsebean
- horse-block
- horsebox
- horse brass
- horse breeder
- horse chestnut
- horse cloth
- horse collar
- horse-coper
- horse dealer
- horse doctor
- horse-drawn
- horse duffer
- horsefeathers
- horseflesh
- horse float
- horsefly
- Horse Guards
- horsehair
- horsehair worm
- Horsehead Nebula
- horsehide
- horse latitudes