# Tschirnhausen cubic

> English word · Noun

## Definitions
1. A plane curve defined, in its left-opening form, by the polar equation r=a sec ³(θ/3) where sec is the secant function.

## Etymology
Named after Ehrenfried Walther von Tschirnhaus (1651–1708), German mathematician, physicist, physician, and philosopher. The name was first used in a 1900 paper by R. C. Archibald.

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