Meanings
- historicalEither of two types of instrument used to measure the speed of light.
Origin
Named after Hippolyte Fizeau and Léon Foucault.
Full word history & related roots →Cite this entry
Fizeau-Foucault apparatus. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/Fizeau-Foucault%20apparatus
“Fizeau-Foucault apparatus.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Fizeau-Foucault%20apparatus. Accessed November 5, 2026.
WatkinsX Dictionary, s.v. “Fizeau-Foucault apparatus,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/Fizeau-Foucault%20apparatus.
Source: Fizeau-Foucault apparatus on Wiktionary, CC BY-SA 4.0.