chemical ray
now historical
noun
An invisible constituent of light which acts on a photographic plate and has other chemical effects; an actinic ray; an ultraviolet ray; usually in plural.
Origin
Early 19th century; earliest use found in Journal of Natural Philosophy, Chemistry and the Arts.
- social partner
- social phobia
- social planner
- social planning
- social problem
- social process
- social promotion
- social psychiatric
- social psychiatrist
- social psychiatry
- social-psychological
- social psychologist
- social psychology
- social realism
- social realist
- social realistic
- social reality
- social register
- social revolution
- social revolutionary
- social role
- social scale
- social science
- social scientific
- social scientist