The Spanish word 'armario' (meaning 'cabinet' or 'wardrobe') comes from the Latin word 'armarium', which meant 'storage place' or 'cabinet'. The Latin word 'armarium' was formed by combining two parts: the root 'arma' (meaning 'weapons' or 'tools') and the suffix '-arium' (meaning 'place for'). So literally, an 'armarium' was originally a place for storing weapons or tools, before its meaning broadened to refer to any kind of storage cabinet or wardrobe.

A simpler related Spanish word is 'arma' (meaning 'weapon'), which comes directly from the same Latin root 'arma'. While 'arma' retained its original meaning of 'weapon', its derivative 'armario' evolved to refer to any storage furniture, not just weapon storage.

The English word 'armory' is related to 'armario', as both ultimately come from Latin 'arma'. However, while Spanish 'armario' evolved to mean any kind of cabinet, English 'armory' specifically retained its connection to weapons, referring to a place where weapons are stored or manufactured. The English word 'armament' (military weapons) is another related term from the same Latin root.