Etymology
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synclinal (adj.)

"sloping downward on both sides," 1833 (in Lyell), from -al (1) + Latinized form of stem of Greek synklinein "to incline, lean," from syn- "together" (see syn-) + klinein "to slope," from PIE root *klei- "to lean."

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Definitions of synclinal

synclinal (adj.)
sloping downward toward each other to create a trough;
From wordnet.princeton.edu