'allergen-triggered' originates from the combination of 'allergen' and 'triggered'. 'Allergen' comes from the Greek word 'allergia', meaning 'other action', and 'triggered' is derived from the Middle English 'triggere', meaning 'to pull or activate'.

'allergen' evolved from the Greek 'allergia' through French 'allergène', and 'triggered' evolved from Middle English 'triggere'.

Initially, 'allergen' referred to any substance causing an allergic reaction, and 'triggered' meant to activate or set off. Together, they describe a reaction activated by an allergen.