helmholtz

noun

1. Her·mann Lud·wig Fer·di·nand von [her-mahn loot-vik fer-di-nahnt fuh n] /ˈhɛr mɑn ˈlut vɪk ˈfɛr dɪˌnɑnt fən/, 1821–94, German physiologist and physicist.

noun

1. Baron Hermann Ludwig Ferdinand von (ˈhɛrman ˈluːtvɪç ˈfɛrdinant fɔn). 1821–94, German physiologist, physicist, and mathematician: helped to found the theory of the conservation of energy; invented the ophthalmoscope (1850); and investigated the mechanics of sight and sound

1. German physicist and physiologist who was a founder of the law of conservation of energy. Helmholtz did pioneering research on vision and invented an instrument for examining the interior of the eye in 1851.