Definitions for thunderheadˈθʌn dərˌhɛd
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Random House Webster's College Dictionary
thun•der•headˈθʌn dərˌhɛd(n.)
a cumulonimbus cloud.
Category: Meteorology
Origin of thunderhead:
1850–55
Wiktionary
thunderhead(Noun)
The top portion of a cumulonimbus cloud, which tend to be flattened or fibery in appearance, and which may be indicative of thunderstorm activity.
Webster Dictionary
Thunderhead(noun)
a rounded mass of cloud, with shining white edges; a cumulus, -- often appearing before a thunderstorm
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