'unoxidized' originates from English prefix 'un-' (from Old English/Proto-Germanic elements meaning 'not') combined with the verb 'oxidize', which itself comes from Modern Latin/French formations related to 'oxide' and ultimately Greek 'oxys' meaning 'sharp' or 'acid'.

'oxidize' entered English in the 18th–19th century via French ('oxydiser') and Modern Latin ('oxydare') related to 'oxide'; adding the productive English prefix 'un-' produced 'unoxidized' as the negative form in technical usage.

Initially related words described formation of 'oxide' or 'combination with oxygen'; over time 'unoxidized' came to be used simply to mean 'not combined with oxygen' or 'not oxidized' in modern scientific and general usage.