\Syn*cli"nal\, a. [Gr. ? to incline together; sy`n
with + ? to incline.]
1. Inclined downward from opposite directions, so as to meet
   in a common point or line.
2. (Geol.) Formed by strata dipping toward a common line or
   plane; as, a synclinal trough or valley; a synclinal fold;
   -- opposed to anticlinal.
Note: A downward flexure in the case of folded rocks makes a
      synclinal axis, and the alternating upward flexure an
      anticlinal axis.

\Syn*cli"nal\, n. (Geol.)
A synclinal fold.