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 (mə-măt′əs, -mä′təs, -mā′-, măm′ə-təs)
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.]


(Physical Geography) a bumpy, breast-shaped cloud
References in periodicals archive ?
Sometimes, the underside of this anvil is home to a series of rounded Mammatus clouds, also known as Mammatocumulus (meaning 'mammary cloud').
This week we saw the unusual cloud formations, mammatus clouds, over Newcastle which surprised many of you.
Mammatus clouds take their name from the Latin for "udder" or "breast".
Mammatus clouds -These are some of the most unusual and distinctive clouds formations with a series of bulges or pouches emerging through the base of the cloud.They are usually formed in association with large cumulonimbus clouds, particular when these are forming large thunderstorms.
Mammatus clouds over Byker, Newcastle | SIMON GREENER
The event also featured Canadian-born artist Kelly Richardson, whose work involves melding real footage with digital elements, such as combining a billowing factory with beautiful Mammatus clouds. She's currently working on a project for the Northern Gallery of Contemporary Art, commissioned by Pixel Palace.