1) Pertaining to such a fold 
• (n.) A synclinal fold. • (a.) Formed by strata dipping toward a common line or plane; as, a synclinal trough or valley; a synclinal fold; -- opposed to anticlinal. • (a.) Inclined downward from opposite directions, so as to meet in a common point or line.
1. Inclined downward from opposite directions, so as to meet in a common point or line. ... 2. <geology> Formed by strata dipping toward a common line or plane; as, a synclinal trough or valley; a synclinal fold; opposed to anticlinal. ... A downward flexure in the case of folded rocks makes a synclinal axis, and the alternating upward flexur...
Syn·cli'nal adjective [ Greek ... to incline together; 
Type: Term Pronunciation: sin′kli-năl Definitions: 1. Denoting two structures inclined one toward the other.
[adj] - (geology) sloping downward toward each other to create a trough
adjective sloping downward toward each other to create a trough
sloping downward from opposite directions so as to meet in a common point or line. · · inclining upward on both sides from a median line or axis, as a downward fold of rock strata. · pertaining to such a fold.