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Plural of cumulus.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in classic literature ?
by S., clear sky with few cumuli; temperature 57 degs., dew-point 36 degs., -- difference
Julian: in the morning, light winds with much rain, followed by a very heavy squall with rain, -- settled into heavy gale with large cumuli, -- cleared up, blowing very strong from S.S.W.
On the horizon fine streaks of cirrhous clouds were succeeded by masses of cumuli. Other low clouds passed swiftly by.