Archaeolithic
Ar`chae`o`lith´ic
(är`kė`ô`lĭth´ĭk)| a. | 1. | (Archæol.) Of or pertaining to the earliest Stone age; - applied to a prehistoric period preceding the Paleolithic age. |
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.