( ( decibel ( ( A measurement ) ( of ( sound intensity ) ) ) ) . )
(ROOT (S (VP (VB decibel) (NP (NP (DT A) (NN measurement)) (PP (IN of) (NP (JJ sound) (NN intensity))))) (. .)))
decibel A measurement of sound intensity.
(ROOT (S (NP (NNP Decibel)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (VP (VBN used) (S (VP (TO to) (VP (VB measure) (NP (NP (DT the) (NN intensity)) (PP (IN of) (NP (JJ sound) (NNS waves)))))))))) (. .)))