( sphygmomanometer ( ( An instrument ) ( ( used ( to ( measure ( blood pressure ) ) ) ) . ) ) )
(ROOT (S (ADVP (RB sphygmomanometer)) (NP (DT An) (NN instrument)) (VP (VBD used) (S (VP (TO to) (VP (VB measure) (NP (NN blood) (NN pressure)))))) (. .)))
sphygmomanometer An instrument used to measure blood pressure.
(ROOT (S (NP (NNP Sphygmomanometer)) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB measure) (NP (NN blood) (NN pressure))))))) (. .)))