arcsine
noun
arc·sine
(ˌ)ärk-ˈsīn 
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
Cite this Entry
“Arcsine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/arcsine. Accessed 30 Jun. 2025.
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