See Also: Ordovician(medicine)
Ordovician(dictionary)
Ordovician Period(encyclopedia)

Ordovician (iou)



Ordovician adjective & noun. L19.
[from Latin Ordovices, an ancient Brit. tribe in N. Wales + -IAN.]
Geology.
A. adjective. Designating or pertaining to the second period of the Palaeozoic era, following the Cambrian and preceding the Silurian. L19.
b. noun. The Ordovician period; the system of rocks dating from this time. L19.