The Collaborative International Dictionary
Archaeolithic
Archaeolithic \Ar`ch[ae]*o*lith"ic\ ([aum]r`k[-e]*[-o]*l[i^]th"[i^]k), a. [Gr. 'archai^os ancient + liqiko`s pertaining to a stone.] (Arch[ae]ol.) Of or pertaining to the earliest Stone age; -- applied to a prehistoric period preceding the Paleolithic age.
Wiktionary
archaeolithic
a. Of or relating to the earliest Stone Age; applied to a prehistoric period preceding the Paleolithic.