cu·mu·lus 
(kymyə-ləs)
(kymyə-ləs)n. pl. cu·mu·li (-lī′)
1. A dense, white, fluffy, flat-based cloud with a multiple rounded top and a well-defined outline, usually formed by the ascent of thermally unstable air masses.
2. A pile, mound, or heap.
[Latin, heap; see keuə- in the Appendix of Indo-European roots.]
cumulus- groundskeeping
- ground sloth
- ground speed
- groundspeed
- ground squirrel
- ground state
- ground stroke
- ground substance
- groundswell
- ground tissue
- ground truth
- groundtruth
- ground-truth
- groundwater
- ground water
- ground wave
- groundwork
- ground zero
- group
- grouper
- group home
- groupie
- grouping
- group insurance
- group practice