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.
- field conventicle
- field conventicler
- field-conventicling
- field corn
- field cornet
- field-cornetcy
- field course
- fieldcraft
- field cricket
- field culverin
- field curvature
- field dance
- field day
- field defect
- field deputy
- field derrick
- field dinner
- field drain
- field-dress
- field dressing
- field driver
- field editor
- field-effect transistor
- field elm
- field emission