( ( wavelength ( ( The distance ) ( between ( ( adjacent peaks ) ( in ( ( a series ) ( of ( periodic waves ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB wavelength) (NP (NP (DT The) (NN distance)) (PP (IN between) (NP (NP (JJ adjacent) (NNS peaks)) (PP (IN in) (NP (NP (DT a) (NN series)) (PP (IN of) (NP (JJ periodic) (NNS waves))))))))) (. .)))
wavelength The distance between adjacent peaks in a series of periodic waves.
(ROOT (S (NP (NNP Wavelength)) (VP (VBZ is) (NP (NP (DT the) (NN distance)) (PP (IN between) (NP (NP (CD two) (JJ corresponding) (NNS points)) (PP (IN of) (NP (NP (JJ adjacent) (NNS waves)) (VP (VBN called)))))))) (. .)))
Wavelength is the distance between two corresponding points of adjacent waves called.