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The Collaborative International Dictionary
Synclinoria

Synclinorium \Syn`cli*no"ri*um\, n.; pl. Synclinoria. [NL., fr. Gr. ? to lay together + ? mountain.] (Geol.) A mountain range owing its origin to the progress of a geosynclinal, and ending in a catastrophe of displacement and upturning.
--Dana.

Wiktionary
synclinoria

n. (plural of synclinorium English)

WordNet
synclinoria