Thunderhead

//ˈθʌndɚˌhɛd// noun

Definitions

Noun
  1. 1
    The top portion of a cumulonimbus cloud, which tends to be flattened or fibery in appearance, and may be indicative of thunderstorm activity.

    "Half the sky was checkered with black thunderheads, but all the west was luminous and clear:"

  2. 2
    a rounded projecting mass of a cumulus cloud with shining edges; often appears before a thunderstorm wordnet

Etymology

From thunder + head.

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