The Spanish word 'armado' meaning 'armed' comes from the Latin past participle 'armatus' with the same meaning. This Latin word derived from the verb 'armare' meaning 'to arm', which itself came from the Latin noun 'arma' meaning 'weapons'. The Latin verb 'armare' also gave rise to the Spanish verb 'armar' ('to arm'), from which we get the past participle form 'armado'.

Some related Spanish words that might be familiar to Spanish learners include 'arma' (weapon), which directly preserves the Latin word, and the verb 'armar' (to arm, to assemble). You might also recognize 'armamento' (armament) and 'armadura' (armor).

English speakers can easily connect 'armado' to several familiar English words that share the same Latin root: 'arm' (as in 'to arm oneself'), 'arms' (weapons), 'armor', 'army', and 'armament'. All these words trace back to the Latin 'arma' for weapons. The similarity between Spanish 'armado' and English 'armed' makes this word particularly easy to remember for English speakers.