# versed sine

> English word · Noun

## Definitions
1. The trigonometric function 1 − cos(x).

## Etymology
From New Latin sinus versus (“flipped sine”); the sine function being sometimes called sinus rectus.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/versed-sine