mammatus


mam·ma·tus

M5072950 (mə-măt′əs, -mä′təs, -mā′-, măm′ə-təs)adj. A cloud formation consisting of rounded, usually smooth protuberances that appear to hang down from the base of cumulonimbus or other clouds.
[From Latin mammātus, having breasts, from mamma, breast; see mā- in Indo-European roots.]

mammatus

(mæˈmeɪtəs) n (Physical Geography) a bumpy, breast-shaped cloud