[ yoo-jee-oh-sing-klahyn, -sin- ]
/ yuˌdʒi oʊˈsɪŋ klaɪn, -ˈsɪn- /
a former marine zone, bordering an ocean basin, marked by very thick deposits of sediment in which the products of volcanic activity are associated with clastic sediments.
Related formseu·ge·o·syn·cli·nal, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019