cumulus.

A cloud with a rounded, piled appearance and a relatively flat base.

Use it for

Words that belong together

• white cumulus
• cumulus cloud
• growing cumulus

On the page

A cumulus cloud rose above the forest.

The cumuli cast moving shadows across the fields.

By late afternoon, the small cumulus had grown much taller.

Usage notes

Primary category: environment. Often associated with fair weather when small, but can grow into storm clouds. Plural: cumuli; also used collectively as a cloud type.