thunderhead

[ thuhn-der-hed ]
/ ˈθʌn dərˌhɛd /

noun Meteorology.

the upper portion of a cumulus cloud characterized by dense, sharply defined, cauliflowerlike upper parts and sometimes by great verticality.

Origin of thunderhead

An Americanism dating back to 1850–55; thunder + head

Example sentences from the Web for thunderhead

British Dictionary definitions for thunderhead

thunderhead
/ (ˈθʌndəˌhɛd) /

noun

mainly US and Canadian the anvil-shaped top of a cumulonimbus cloud