Cumulus (noun)

A type of cloud that is characterized by a flat base and a white, puffy top, often resembling a pile of cotton.

Origin:

The word 'cumulus' is derived from the latin word 'cumulo' meaning 'to heap, pile up'.

Examples:

1. The sky was dotted with fluffy cumulus clouds on a hot summer day.
2. The pilot flew through the towering cumulus clouds, watching as they changed shape and size.
3. The cumulus clouds provided a stark contrast to the clear blue sky above.
4. The meteorologist used satellite images to track the movement of cumulus clouds and predict the weather.
5. The cumulus clouds grew larger and darker as the storm approached, eventually becoming cumulonimbus clouds.