Pronunciation: (sin-klīn'l, sing-, sing'kli-nl), [key]
1. sloping downward from opposite directions so as to meet in a common point or line.
a. inclining upward on both sides from a median line or axis, as a downward fold of rock strata.
b. pertaining to such a fold.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.