1. A cloud in convex masses piled one upon another. Cumulo-stratus, cumulus clouds having a stratified appearance.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• cumpus,
• simulus,
• tumulous,
• caculus,
• cummulus,
• cinxlus,
• cuculus,
• cucumms,
• cumullus,
• cummulous,
• cumulous,
• cupulle,
• tamulus,
• humullus,
• humuluss,
• humulus,
• lymulus,
• lukulus,
• tumullus,
• tumulus

• Cumuli,
• cumulous.

The adjective form of the word "cumulus" is "cumulous".

The plural of the "cumulus" can be the "cumuli".

The singular of the "cumulus" can be the "cumulus".