semidiurnal

adjective

semi·​di·​ur·​nal ˌse-mē-dī-ˈər-nᵊl How to pronounce semidiurnal (audio)
ˌse-ˌmī-,
-mi-
1
: relating to or accomplished in half a day
2
: occurring twice a day
3
: occurring approximately every half day
the semidiurnal tides

Word History

First Known Use

1594, in the meaning defined at sense 1

Time Traveler
The first known use of semidiurnal was in 1594

Dictionary Entries Near semidiurnal

Cite this Entry

“Semidiurnal.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/semidiurnal. Accessed 21 Jul. 2024.

Love words? Need even more definitions?

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