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eugeosyncline

American  
[yoo-jee-oh-sing-klahyn, -sin-] / yuˌdʒi oʊˈsɪŋ klaɪn, -ˈsɪn- /

noun

Geology.

  1. 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.

Other Word Forms

  • eugeosynclinal adjective

Etymology

Origin of eugeosyncline

First recorded in 1940–45; eu- + geosyncline

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.