1855, back-formation from synclinal.
"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."
updated on January 12, 2014
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