versed sine

noun Trigonometry.
one minus the cosine of a given angle or arc. Abbreviation: vers.
Also called versine, versin.

1590–1600 Unabridged


noun Trigonometry.
Also, versin. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
versed sine
vers a trigonometric function equal to one minus the cosine of the specified angle
[C16: from New Latin sinus versus, from sine1 + versus turned, from vertere to turn]

Collins English Dictionary - Complete & Unabridged 10th Edition
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