foucault fou • foucault pendulum · · · Info · Definitions · Characters · · foucault · · Text Latin · · Script 8 · · Length 3 · · Syllables Definitions · · · (noun) French physicist who determined the speed of light and showed that it travels slower in water than in air; invented the Foucault pendulum and the gyroscope (1819-1868). Synonyms: Foucault, Jean Bernard Leon Foucault. · · Noun Definition 1 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 f latin small letter f U+0066 l latin small letter l U+006C o latin small letter o U+006F t latin small letter t U+0074 u latin small letter u U+0075