%synclinal%

a. [ Gr. &unr_; to incline together; sy`n with + &unr_; to incline. ] 1. Inclined downward from opposite directions, so as to meet in a common point or line. [ 1913 Webster ]

2. (Geol.) Formed by strata dipping toward a common line or plane; as, a synclinal trough or valley; a synclinal fold; -- opposed to anticlinal. [ 1913 Webster ]

☞ A downward flexure in the case of folded rocks makes a synclinal axis, and the alternating upward flexure an anticlinal axis. [ 1913 Webster ]