Synclinal

Adjective

syn=cli=nal

WORDNET DICTIONARY

synclinal(a = adj.all) - sloping downward toward each other to create a trough;

Synclinal, a. [Gr. to incline together; sy`n with + to incline.].

Inclined downward from opposite directions, so as to meet in a common point or line. [1913 Webster]
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]

Synclinal, n.

A synclinal fold. [1913 Webster]