prehistoricPronunciation: /priːhɪˈstɒrɪk/Translate prehistoric | into French | into German | into Italian | into Spanish Definition of prehistoric adjective relating to or denoting the period before written records:prehistoric man informal very old, primitive, or out of date:my dad’s electric typewriter was a prehistoric machineDerivatives prehistorically adverb Origin: mid 19th century: from French préhistorique (see pre-, historic)prehistoric in other Oxford dictionaries Definition of prehistoric in the US English dictionary