trepan

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Related to trepanations: trephination, burr holes
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Among them, 45 separate trepanation procedures were in evidence.
Among these were several pierced skulls, alluding to the practice of trepanation, an age-old surgical procedure to exorcise evil spirits; today it is still (although rarely) practiced, particularly in certain subcultures, as a means of attaining a higher level of consciousness.