Bible Dictionaries
Oligocene

Webster's Dictionary

(1):

(n.) The Oligocene period. See the Chart of Geology.

(2):

(a.) Of, pertaining to, or designating, certain strata which occupy an intermediate position between the Eocene and Miocene periods.

Bibliography Information
Webster, Noah. Entry for 'Oligocene'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​o/oligocene.html. 1828.