'anaesthesiology' originates from Greek, specifically the word 'anaisthēsia,' where 'an-' meant 'without' and 'aisthēsis' meant 'sensation,' combined with '-logy' meaning 'the study of.'

'anaesthesiology' was formed in the 19th century from the Greek roots and the suffix '-logy,' and eventually became the modern English word 'anaesthesiology.'

Initially, it meant 'the study of anesthesia,' and this meaning has remained the same in modern usage.