( a. )
Of or pertaining to a division of the Silurian formation, corresponding in general to the Lower Silurian of most authors, exclusive of the Cambrian.
( a. )
Of or pertaining to a division of the Silurian formation, corresponding in general to the Lower Silurian of most authors, exclusive of the Cambrian.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012