/thun"deuhr hed'/ , n. Meteorol.
1. incus (def. 2).
2. cumulonimbus.
3. the upper portion of a cumulus cloud characterized by dense, sharply defined, cauliflowerlike upper parts and sometimes by great verticality.
[ 1850-55, Amer.; THUNDER + HEAD ]
/thun"deuhr hed'/ , n. Meteorol.
1. incus (def. 2).
2. cumulonimbus.
3. the upper portion of a cumulus cloud characterized by dense, sharply defined, cauliflowerlike upper parts and sometimes by great verticality.
[ 1850-55, Amer.; THUNDER + HEAD ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012