'bandager' originates from English, specifically the word 'bandage' with the agentive suffix '-er', where 'bandage' ultimately came from Old French 'bandage' and the verb 'bander' which meant 'to bind'.

'bandage' changed from the Old French word 'bandage' (from the verb 'bander') and eventually became the modern English word 'bandage'; English then formed 'bandager' by adding the agentive suffix '-er' to mean 'one who bandages'.

Initially it meant 'a binding' or 'the act of binding', but over time it evolved into its current senses of 'a strip used to bind' or 'the act of applying such a strip', and 'bandager' came to mean 'one who applies a bandage'.