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Define prehistoric. prehistoric synonyms, prehistoric pronunciation, prehistoric translation, English dictionary definition of prehistoric. also preÂ·hisÂ·torÂ·iÂ·cal adj. 1. Of, relating to, or belonging to the era before recorded history. 2. Of or relating to a language before it is first recorded...
In modern terminology, Celtic is used to refer to a certain branch of the Indo-European language group. Some of the tribes called keltoi spoke Celtic languages. However, it is not certain that the Greeks applied keltoi only to Celtic-speaking tribes.