'supratentorial' originates from Latin, specifically the word 'supratentorialis,' where 'supra-' meant 'above' and 'tentorium' referred to the 'tent-like structure in the brain.'

'supratentorialis' transformed into the modern English word 'supratentorial' through scientific Latin usage.

Initially, it meant 'above the tentorium,' and this meaning has largely remained the same in modern medical usage.