Sentence:  ... the voices of thousands of spectators pealing in thunder from the rocks on which their dark and crowded masses rested ... sent forth a shout of mingled triumph on their appearance and approbation of their cause; and its echoes continued to roll round the hills long after the lips of the <WSD>acclaimers</WSD> were closed ... 
Meaning of the word marked with <WSD> tags:  One who salutes or praises with great approval.