'sulfide-less' originates from the English word 'sulfide' combined with the suffix '-less', where 'sulfide' refers to a compound of sulfur with another element or group, and '-less' means 'without'.

'sulfide' changed from the French word 'sulfure' and eventually became the modern English word 'sulfide'.

Initially, 'sulfide' referred to any compound of sulfur, and the addition of '-less' evolved to mean 'without sulfide'.