microlithPronunciation: /ˈmʌɪkrə(ʊ)lɪθ/Definition of microlith noun Archaeology a minute shaped flint, typically part of a composite tool such as a spear. Derivatives microlithicPronunciation: /-ˈlɪθɪk/ adjective microlith in other Oxford dictionaries Definition of microlith in the US English dictionary