Synclinal /(?)/

Syn·cli·nal

Synclinal

a.
  1. Inclined downward from opposite directions, so as to meet in a common point or line.
  2. Formed by strata dipping toward a common line or plane; as, a synclinal trough or valley; a synclinal fold; -- opposed to anticlinal. (Geol.)

Synclinal

n.
  1. A synclinal fold. (Geol.)