thunderhead

[thuhn-der-hed]

thun·der·head

[thuhn-der-hed]
noun Meteorology.
1.
incus (def. 2).
3.
the upper portion of a cumulus cloud characterized by dense, sharply defined, cauliflowerlike upper parts and sometimes by great verticality.

Origin:
1850–55, Americanism; thunder + head
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Thunderhead is always a great word to know.
So is thermal. Does it mean:
a warning of high-wind conditions at sea that are expected to last for up to two hours, and generally result of thunderstorms or squall lines
a rising air current caused by heating from the underlying surface, especially such a current when not producing a cloud
Collins
World English Dictionary
thunderhead (ˈθʌndəˌhɛd)
 
n
chiefly (US), (Canadian) the anvil-shaped top of a cumulonimbus cloud

Collins English Dictionary - Complete & Unabridged 10th Edition
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