# cumulonimbus

> English word · Noun · IPA /ˌkjuː.mjʊ.ləʊˈnɪm.bəs/

## Definitions
1. A cloud with a tall structure and flat base, often associated with thunderstorms.

## Etymology
From Latin cumulus (“heap”) + nimbus (“cloud”).

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