|hīdrə.|träpik- noun
Etymology: hydratropic International Scientific Vocabulary hydr- + atropic being an alpha-phenyl-acrylic acid CH 2 :C(C 6 H 5 )COOH obtainable by the decomposition of atropine (International Scientific Vocabulary atrop- — from atropine — + -ic )
: a colorless liquid acid C 6 H 5 CH(CH 3 )COOH obtained by reduction of alpha-phenyl-acrylic acid; α-phenyl-propionic acid