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Definition of Thunderhead
1. Noun. A rounded projecting mass of a cumulus cloud with shining edges; often appears before a thunderstorm.
Definition of Thunderhead
1. n. A rounded mass of cloud, with shining white edges; a cumulus, -- often appearing before a thunderstorm.
Definition of Thunderhead
1. 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. ¹
¹ Source: wiktionary.com
Definition of Thunderhead
1. [n -S]