eolith
Concise Oxford English Dictionary © 2008 Oxford University Press:
eolith /ˈiːə(ʊ)lɪθ/
▶noun Archaeology a roughly chipped flint found in Tertiary strata, originally thought to be an early artefact but probably of natural origin.
– origin C19: from Gk ēōs ‘dawn’ + lithos ‘stone’.
'eolith' also found in these Oxford entries:

