ruby hole
now historical
noun
A small hole cut in a piece of ruby, especially in a watch escapement.
Origin
Mid 18th century.
- photomacrography
- photo magazine
- photomagnetic
- photomagnetism
- photomagnetoelectric
- photomap
- photo-mapper
- photo-mapping
- photomask
- Photomat
- Photomaton
- photo-matrix
- photomechanical
- photomechanically
- photomesic
- photomeson
- photomesonic
- photometallography
- photometer
- photometer bench
- photometer head
- photometric
- photometrical
- photometrically
- photometric bench