UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈhævəˌsaɪn/US:USA pronunciation: respellingUSA pronunciation: respelling(havər sīn′)

WordReference Random House Unabridged Dictionary of American English © 2020
hav•er•sine  (havər sīn′),USA pronunciation n. [Trigonom.]
  1. Mathematicsone half the versed sine of a given angle or arc.
  • ha(lf) + ver(sed) + sine1 1870–75

Collins Concise English Dictionary © HarperCollins Publishers::
haversine /ˈhævəˌsaɪn/ n
  1. obsolete half the value of the versed sine
Etymology: 19th Century: combination of half + versed + sine1

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