Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Geology A fold in rocks in which the rock layers dip inward from both sides toward the axis.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A concave-upward fold in rock strata

from the GNU version of the Collaborative International Dictionary of English

  • n. A synclinal fold.

from The Century Dictionary and Cyclopedia

  • n. Same as synclinal.

Etymologies

Back-formation from synclinal.
(American Heritage® Dictionary of the English Language, Fourth Edition)
syn- + -cline (Wiktionary)

Examples

  • A syncline is a fold where the rock layers are warped downward (Figure 4 and 5).

    Folding and faulting in the Earth's crust

  • With his thin hair dyed rusty brown and brushed straight back off the wide dome of his forehead, and modish wire-framed glasses over small, heavy-lidded eyes, his face was all too familiar, its deeply creased cheeks sagging in a fine cascade of syncline folds to the crisp knot of his blue silk tie.

    Mr. Murdoch Goes to War

  • A fold in the Eliot formation, the Great Bay syncline, passes through Newington to Thomas Point, under Great Bay, then into Stratham near Bracketts Point.

    Great Bay National Estuarine Research Reserve, New Hampshire

  • South Slough NERR lies along a geologic fold, or syncline, which bears its name.

    South Slough National Estuarine Research Reserve, Oregon

  • The outcrops of basement ice shown in Figure 1 are connected by a syncline of basement ice this is a term used in geology.

    Ward Hunt Ice Shelf Stratigraphy « Climate Audit

  • When a water-bearing stratum is enclosed between two impervious layers in a syncline, the water falling on a pervious stratum runs into the synclinal basin and is stored there under pressure.

    Chapter 10

  • "The porphyry dykes here are in syncline," the engineer went on.

    Rimrock Trail

  • Now, a section drawn parallel to the earthquake-fault and on the north-east side of it, would show an anticline near the Hereford focus and a corresponding syncline near the Ross focus, with an undisplaced portion in the intermediate region; while a parallel section on the other side of the fault would show a syncline near the Hereford focus, an anticline near the Ross focus, and again an undisplaced portion in the intermediate region.

    A Study of Recent Earthquakes

  • The anticline has advanced relatively to the syncline.

    The Birth-Time of the World and Other Scientific Essays

  • Thus we find that the ocean floor is depressed into a syncline along the western coast of South America; a trough always parallel to the ranges of the Andes.

    The Birth-Time of the World and Other Scientific Essays

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