Michelson-Morley experiment


Mi·​chel·​son-Mor·​ley experiment
: an experiment that shows that the two parts of a divided ray of light travel at the same speed over paths perpendicular to each other (as over east-west and north-south paths) and that leads to the deductions that the motion of the earth through space has no effect upon the velocity of light and the absolute motion of the earth is not measurable

Word History


after Albert A. Michelson †1931 American physicist and Edward W. Morley †1923 American chemist and physicist

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Dictionary Entries Near Michelson-Morley experiment


Michelson-Morley experiment


Cite this Entry

“Michelson-Morley experiment.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Michelson-Morley%20experiment. Accessed 26 May. 2024.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!