'hazardously-separated' originates from the combination of 'hazardous' and 'separated', where 'hazardous' comes from the Old French 'hasard', meaning 'game of chance', and 'separated' from Latin 'separatus', meaning 'to divide'.

'hazardous' evolved from the Old French 'hasard', and 'separated' from the Latin 'separatus', eventually forming the modern English term 'hazardously-separated'.

Initially, 'hazardous' meant 'game of chance', but over time it evolved to mean 'involving risk or danger', while 'separated' has largely retained its original meaning of 'divided'.