ruby hole
now historical
noun
A small hole cut in a piece of ruby, especially in a watch escapement.
Origin
Mid 18th century.
- prototoxoid
- prototraitor
- prototroch
- prototroph
- prototrophic
- prototrophy
- prototropic
- prototropy
- prototypal
- prototype
- prototypic
- prototypical
- prototypicality
- prototypically
- prototypographer
- protovertebra
- protovertebrate
- protovestiary
- protovirus
- Proto-World
- protoxide
- protoxylem
- min dae
- mindae
- mind-altering