A type of cloud that is characterized by a flat base and a white, puffy top, often resembling a pile of cotton.
The word 'cumulus' is derived from the latin word 'cumulo' meaning 'to heap, pile up'.
- The sky was dotted with fluffy cumulus clouds on a hot summer day.
- The pilot flew through the towering cumulus clouds, watching as they changed shape and size.
- The cumulus clouds provided a stark contrast to the clear blue sky above.
- The meteorologist used satellite images to track the movement of cumulus clouds and predict the weather.
- The cumulus clouds grew larger and darker as the storm approached, eventually becoming cumulonimbus clouds.