'anaerobious' originates from Greek, specifically the word 'an-' meaning 'without' and 'aer' meaning 'air', combined with '-bios' meaning 'life'.

'anaerobious' changed from the Greek word 'anaerobios' and eventually became the modern English word 'anaerobious'.

Initially, it meant 'living without air', but over time it evolved into its current meaning of 'relating to or requiring an absence of free oxygen'.