| ̷ ̷ ̷ ̷ˌ ̷ ̷+...- noun
Etymology: naphthalene + acetic
: either of two crystalline naphthyl derivatives C 10 H 7 CH 2 COOH of acetic acid ; especially : the alpha or 1-compound used as a growth regulator for plants (as for preventing drop of apples before normal harvest time)