Mamma

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mamma

(Also called mammatus.) Hanging protuberances, like pouches, on the undersurface of a cloud.

This supplementary cloud feature occurs mostly with cirrus, cirrocumulus, altocumulus, altostratus, stratocumulus, and cumulonimbus; in the case of cumulonimbus, mamma generally appear on the underside of the anvil (incus).
See cloud classification.

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