pounding
     n 1: repeated heavy blows [syn: {buffeting}]
     2: an instance of rapid strong pulsation (of the heart); "he
        felt a throbbing in his head" [syn: {throb}, {throbbing}]
     3: the act of pounding (delivering repeated heavy blows); "the
        sudden hammer of fists caught him off guard"; "the
        pounding of feet on the hallway" [syn: {hammer}, {pound},
        {hammering}]
Source: WordNet® 2.0