# tholin

> English word · Noun

## Definitions
1. Any of several poorly classified heteropolymers derived from simple hydrocarbons and ammonia formed by solar irradiation in the atmospheres of icy planets and moons.

## Etymology
From Ancient Greek θολός (tholós, “muddy”) + -in. Coined by Carl Sagan and Bishun Khare in 1979. From the muddy coloration that this class of chemical compounds appear to have, when observed on the Saturnian moon Titan, and from Miller–Urey-style experiments.

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