( Organ ( ( is ( ( a ( technical term ) ) ( ( used ( in biology ) ) ( to ( describe ( ( a ( physical structure ) ) ( composed ( of ( living tissue ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Organ)) (VP (VBZ is) (NP (NP (DT a) (JJ technical) (NN term)) (VP (VBN used) (PP (IN in) (NP (NN biology))) (S (VP (TO to) (VP (VB describe) (NP (NP (DT a) (JJ physical) (NN structure)) (VP (VBN composed) (PP (IN of) (S (VP (VBG living) (NP (NN tissue))))))))))))) (. .)))
Organ is a technical term used in biology to describe a physical structure composed of living tissue.
(ROOT (S (NP (DT A) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN organ)) (VP (VBZ is) (NP (NP (DT a) (NN structure)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN composed) (PP (IN of) (NP (NP (QP (CD one) (CC or) (JJR more)) (NNS types)) (PP (IN of) (NP (NNS tissues))))))))))) (. .)))
A(n) organ is a structure that is composed of one or more types of tissues.