Etymology
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thunderhead (n.)

"high-piled cumulus cloud," one likely to develop into a thunderstorm, 1861, from thunder (n.) + head (n.).

updated on February 09, 2014

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Definitions of thunderhead from WordNet

thunderhead (n.)
a rounded projecting mass of a cumulus cloud with shining edges; often appears before a thunderstorm;
From wordnet.princeton.edu, not affiliated with etymonline.