synclinal adjective 3noun 1forms 3 adjective3 •Inclined downward from opposite directions, so as to meet in a common point or line.The doctor's eyebrows had gone synclinal from puzzlement without his awareness. — 1996 •Formed by strata dipping toward a common line or plane. •Having or relating to a torsion angle between 30° and 90° noun1 •A synclinal fold. formssynclinals · more synclinal · most synclinal