also: にゅうぼううん
mammatus cloud; mammatocumulus; festoon cloud
A meteorological term for pouch-like cloud formations hanging beneath a cloud base, often associated with severe weather.
Mammatus clouds are often seen at the base of cumulonimbus clouds.
The weather forecaster reported the formation of mammatus clouds.
Standard kanji spelling; the reading ちぶさぐも is the most common pronunciation.
Alternate on'yomi reading; less common but still used in meteorological contexts.
Compound of 乳房 (ちぶさ, 'breast, udder') and 雲 (くも, 'cloud'), from the cloud's resemblance to a cluster of breasts or udders. The on'yomi reading にゅうぼううん follows the same pattern.