# cenosphere

> English word · Noun

## Definitions
1. A porous or hollow carbonaceous sphere-like particle formed during pyrolysis or in the course of the combustion of coal.

## Etymology
From ceno- + -sphere.

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