Simple Definition of cumulus
: a type of thick cloud that is rounded on top and has a flat base
Examples of cumulus
<the cumulus of sundry things that fill up one's attic and somehow sum up a lifetime of experiences>
Origin of cumulus
First Known Use: 1659
Seen and Heard
What made you want to look up cumulus? Please tell us where you read or heard it (including the quote, if possible).