Etymology

From thunder +‎ headCategory:English compound terms#THUNDERHEAD.

Pronunciation

• (General American) IPA^(key): /ˈθʌndɚˌhɛd/Category:English 3-syllable words#THUNDERHEADCategory:English terms with IPA pronunciation#THUNDERHEAD

• Audio (US):

  (file)

  Category:English terms with audio pronunciation#THUNDERHEAD

Noun

thunderhead (plural thunderheads)Category:English lemmas#THUNDERHEADCategory:English nouns#THUNDERHEADCategory:English countable nouns#THUNDERHEADCategory:English entries with incorrect language header#THUNDERHEADCategory:Pages with entries#THUNDERHEADCategory:Pages with 1 entry#THUNDERHEAD

English Wikipedia has an article on:

Cumulonimbus cloud

Wikipedia

1. The top portion of a cumulonimbus cloud, which tends to be flattened or fibery in appearance, and may be indicative of thunderstorm activity.
   • 1918, Willa Cather, chapter 19, in My Ántonia‎, Boston: Houghton Mifflin, page 158:

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

     Category:English terms with quotations#THUNDERHEAD

   • 1947, Kenneth Roberts, chapter 28, in Lydia Bailey‎, Garden City, NY: Doubleday:

     The wisps of smoke above Léogane became dark and thick, and flowered into a towering thunderhead—an ominous cloud that drifted slowly to the westward and was constantly replenished at its base by uprushes of blacker smoke.

     Category:English terms with quotations#THUNDERHEAD

     Category:Quotation templates to be cleaned
   • 2000, Philip Pullman, chapter 29, in The Amber Spyglass‎, New York: Del Rey, page 349:

     The sky ahead was huge with storm: all the whiteness had gone from the thunderheads, and they rolled and swirled with sulphur yellow, sea green, smoke gray, oil black, a queasy churning miles high and as wide as the horizon.

     Category:English terms with quotations#THUNDERHEAD