suversed en · ADJ
Meanings
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(not-comparable) versed and belonging to the supplement
The key insight was to replace the law of cosines by a law of versed sines or a law of suversed sines, where the suversed sine of an angle is the versed sine of the supplement of that angle.
2015, Maria Zack, Elaine Landry, Research in History and Philosophy of Mathematics, page 45: