Century Dictionary and Cyclopedia - n. A cloud consisting of a
group of udder-shaped festoons falling from cumulus or strato-
cumulus clouds, particularly in the immediate rear of summer
storms. Also called rain-balls. Sorry, no example sentences
found. These user-created lists contain the word ‘udder-cloud’.
We owe our current names for clouds to Luke Howard. Wikipedia
tells us that "Howard was not the first to attempt a
classification of clouds—Jean-Baptiste Lamarck (1744–1829) had
earlier proposed a ... Looking for tweets for udder-cloud.