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# cumulus

noun (cumulus, uncountable; cumulus clouds; plural cumuli, rare)

«cumulus» in the English dictionary: everyday — its meanings, how the lessons use it, and examples, each with its tree on Mova.

## Everyday

1. Cumulus is a type of white, puffy cloud with a flat bottom and a rounded top, like cotton wool. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/cumulus/#m1)
2. Cumulus clouds usually mean fine weather, but very tall ones can grow into storm clouds (cumulonimbus). [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/cumulus/#m2)

### In the lessons

In science and geography lessons on weather, cumulus clouds form when warm air rises; they are the clouds children draw. The name comes from Latin "heap". Compare with stratus (flat layers) and cirrus (high, wispy). Phrases: cumulus clouds, fair-weather cumulus, cumulonimbus.

### Examples

- Fluffy cumulus clouds floated across the blue sky. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/cumulus/#x1)
- Cumulus clouds look like cotton wool. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/cumulus/#x2)
- A cumulus cloud has a flat bottom and a puffy top. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/cumulus/#x3)
- Big cumulonimbus clouds can bring thunderstorms. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/cumulus/#x4)
- We drew cumulus, stratus and cirrus clouds in science. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/cumulus/#x5)
- The cumulus clouds meant it would stay sunny. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/cumulus/#x6)

### Note

Pronounced "KYOO-myoo-lus". Usually uncountable or "cumulus clouds". Related word: cumulative (adding up step by step), from the same Latin root meaning heap.

## On Mova

- [Trees and pragmatics of «cumulus» in the school dictionary](https://mova.elamur.ai/free/en/corpora/dictionaries/school/C/cumulus/): every meaning and example parsed by Mova, with its dependency tree and frames.
- [«cumulus» in the school dictionary](https://mova.elamur.ai/free/en/dictionaries/school/w/cumulus.html) on Mova free.