( ( ( Opacity Opacity ) ( of ( a ( transparent material ) ) ) ) ( ( is ( ( the reciprocal ) ( of ( its ( light-transmitting value ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Opacity) (NNP Opacity)) (PP (IN of) (NP (DT a) (JJ transparent) (NN material)))) (VP (VBZ is) (NP (NP (DT the) (NN reciprocal)) (PP (IN of) (NP (PRP$ its) (JJ light-transmitting) (NN value))))) (. .)))
Opacity Opacity of a transparent material is the reciprocal of its light-transmitting value.
(ROOT (S (NP (JJ Transparent) (NN matter)) (VP (VBZ transmits) (ADJP (JJ light) (PP (IN without) (S (VP (VBG scattering) (NP (PRP it))))))) (. .)))