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WordReference Random House Unabridged Dictionary of American English © 2024Helm•holtz (helm′hōlts),USA pronunciation n. Her•mann Lud•wig Fer•di•nand von (her′män lo̅o̅t′vik fer′di nänt′ fən),USA pronunciation 1821–94, German physiologist and physicist.
Collins Concise English Dictionary © HarperCollins Publishers:: Helmholtz /German: ˈhɛlmhɔlts/ n - 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
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