cumulo-


cumulo-

or cumuli- or cumul-pref. Cumulus: cumulonimbus.
[From cumulus.]

cu•mu•lus

(ˈkyu myə ləs)

n., pl. -li (-ˌlaɪ) 1. a cloud of a class characterized by dense individual elements in the form of puffs, mounds, or towers, with flat bases and tops that often resemble cauliflower. 2. a heap; pile. [1650–60; < New Latin (Latin: mass, pile)]