synclinal

[sin-klahyn-l, sing-, sing-kli-nl]
adjective
1.
sloping downward from opposite directions so as to meet in a common point or line.
2.
Geology.
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.

Origin:
1825–35; syn- + Greek klī́n(ein) to lean1 + -al1

synclinally, adverb
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World English Dictionary
syncline (ˈsɪŋklaɪn)
 
n
Compare anticline a downward fold of stratified rock in which the strata slope towards a vertical axis
 
[C19: from syn- + Greek klīnein to lean]
 
syn'clinal
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

synclinal
"sloping downward on both sides," 1833 (in Lyell), from Gk. synklinein "to incline, lean," from syn- "together" + klinein "to slope" (see lean (v.)).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Lava flows poured from long fissures to fill the axes of synclinal basins.
In general, units thicken in synclinal areas and thin or pinch out across structural highs.
The ridges and pinnacles are the surface expressions of anticlinal and synclinal structures within the fold trends.
The holes were too short to dewater the site area, which was located in a synclinal trough that collected regional coal-bed water.
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