syn·cli·nal /(ˌ)sɪnˈklaɪnḷ/
 (a.)向斜的


 Syn·cli·nal a.
 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.

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 synclinal
      adj : sloping downward toward each other to create a trough [ant:
            anticlinal]