cumulo-, cumul-, cumuli-

1. Having put a heavy load on; burdened: "She was a hiker who was encumbered with a heavy pack."
2. Having hindered or impeded the action or performance of: The judge placed restrictions that encumbered the work of the police."
3. Burdened with legal or financial obligations; such as, an estate that was encumbered with debts.

1. In meteorology, a principal cloud classification, characterized by gray or white, usually stratiform layers that nearly always have dark patches and a nonfibrous aspect; usually arranged in orderly groups, lines, or waves, and composed of small water droplets, sometimes accompanied by larger droplets, soft hail, and (rarely) snowflakes.
2. A cloud formation in a low-lying extensive layer with large dark round or rolling masses.