: the 12th letter of the Greek alphabet see Alphabet Table

Word History

Etymology

Greek my

First Known Use

13th century, in the meaning defined above

Time Traveler
The first known use of mu was in the 13th century

Dictionary Entries Near mu

Cite this Entry

“Mu.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mu. Accessed 14 Apr. 2024.

Kids Definition

mu

noun
: the twelfth letter of the Greek alphabet
Μ or μ

Medical Definition

mu

noun
plural mu
: micron
Love words? Need even more definitions?

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