( Geiger ( ( ( counter ( Electronic instrument ) ) ( for ( ( ( detecting and ) measuring ) ( radiation ( and ( radioactive substances ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Geiger)) (VP (VBP counter) (NP (JJ Electronic) (NN instrument)) (PP (IN for) (S (VP (VBG detecting) (CC and) (VBG measuring) (NP (NN radiation) (CC and) (NN radioactive) (NNS substances)))))) (. .)))
Geiger counter Electronic instrument for detecting and measuring radiation and radioactive substances.
(ROOT (S (NP (NP (DT The) (`` `) (NN counting) ('' ') (NN instrument)) (NP (NN geiger) (NN counter))) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB measure) (NP (NN radioactivity))))))) (. .)))