noun Date: 1942 a narrow rapidly subsiding geosyncline usually with volcanic materials mingled with clastic sediments, eugeosynclinal adjective
EUGEOSYNCLINE
Meaning of EUGEOSYNCLINE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012