# thionine

> English word · Noun

## Definitions
1. An artificial red or violet dyestuff consisting of a complex sulfur derivative of certain aromatic diamines.
2. The unsaturated nine-membered heterocycle having eight carbon atoms, one sulfur atom and four double bonds.

## Etymology
Of Ancient Greek [Term?] origin. See thio- (“sulfur”).

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