Eolithic
/ˌiːəʊˈlɪθɪk/adjective
1- Archaeology, dated of, relating to, or denoting a period at the beginning of the Stone Age, preceding the Palaeolithic and characterized by the earliest crude stone tools【考古】〈旧〉（与）始石器时代（有关）的。
1.1
- as noun the Eolithic the Eolithic period始石器时代。
词源
late 19th cent.: from French éolithique, from Greek ēōs + lithikos （from lithos 'stone'）.