'armoried' originates from Middle English, specifically the adjective/participle formed from 'armour'/'armouren', ultimately from Old French 'armurerie' or 'armorerie' where the root relates to equipping with arms (from Medieval Latin/Old French notions of arms and armor).

'armoried' developed from Middle English forms such as 'armouried' (used as an adjective or past participle meaning 'furnished with armor' or 'bearing arms'), which in turn came from Old French terms related to 'armorer' and 'armurerie' and ultimately from Latin roots tied to 'armare' (to arm).

Initially it referred broadly to matters of arms or an armory (a place or the act of arming); over time it came to be used as an adjective/past participle meaning specifically 'equipped with armor' or 'bearing a coat of arms.'