arc·​sine (ˌ)ärk-ˈsīn How to pronounce arcsine (audio)
variants or less commonly arc sine
plural arcsines also arc sines
: the inverse function of the sine
if y is the sine of θ, then θ is the arcsine of y
abbreviation arcsin

Word History

First Known Use

circa 1889, in the meaning defined above

Time Traveler
The first known use of arcsine was circa 1889

Dictionary Entries Near arcsine

Cite this Entry

“Arcsine.” Dictionary, Merriam-Webster, Accessed 27 Sep. 2023.

Love words? Need even more definitions?

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