cumulonimbus plural
cu·mu·lo·nim·bus
The plural form of cumulonimbus is cumulonimbi
C cDefinitions
- noun plural cumulonimbus a cloud of a class indicative of thunderstorm conditions, characterized by large, dense towers that often reach altitudes of 30,000 feet (9000 meters) or more, cumuliform except for their tops, which appear fibrous because of the presence of ice crystals: occurs as a single cloud or as a group with merged bases and separate tops. 1