'myocardial' originates from New Latin, specifically the word 'myocardium', where the Greek prefix 'myo-' meant 'muscle' and 'kardia' meant 'heart', with the English adjectival suffix '-al'.

'myocardial' changed from the New Latin word 'myocardium' (itself formed from Greek 'myo-' + 'kardia') and eventually became the modern English adjective 'myocardial' by adding the suffix '-al'.

Initially, it meant 'pertaining to the heart muscle'; over time this core meaning has been retained and is now used specifically in medical contexts to describe conditions or structures of the myocardium.