'pigment-resistant' originates from the combination of 'pigment,' which comes from Latin 'pigmentum,' meaning 'coloring matter,' and 'resistant,' from Latin 'resistere,' meaning 'to withstand.'

'Pigmentum' transformed into the Old French 'pigment,' and eventually became the modern English word 'pigment.' 'Resistere' evolved into the Old French 'resister,' leading to the modern English 'resistant.'

Initially, 'pigment' referred to any coloring matter, while 'resistant' meant the ability to withstand. Together, they describe the ability to withstand coloring or staining.