light mill en · NOUN
Etymology
By analogy with windmill and water mill.
Meanings
- An airtight glass bulb containing a partial vacuum and a set of vanes, mounted on a spindle, which rotate when exposed to light, providing a quantitative measurement of electromagnetic radiation intensity.
Forms
| Spelling | Features | Labels | Source |
|---|---|---|---|
| light mills | Number=Plur | lexicographic |