Armed

google

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Middle English: from Old French armer (verb), from Latin armare, from arma ‘armour, arms’.

wiktionary

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arm(“to equip with a weapon”) +‎  -ed. 

arm(“the upper limb of the body”) +‎  -ed. 

etymonline

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armed (adj.)

"equipped for battle," early 13c., past-participle adjective from arm (v.).