mammatocumulus

noun
mam·ma·to·cumulus | \ mə¦mātō , ma¦mātō+ \

Definition of mammatocumulus 

: a cumulus or cumulostratus storm cloud having breast-shaped protuberances below

called also festoon cloud

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History and Etymology for mammatocumulus

New Latin, from Latin mammatus of the breast + New Latin -o- + cumulus

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