'aluminium-composed' originates from the English noun 'aluminium' (from New Latin 'alumen', where 'alumen' meant 'bitter salt') combined with the English past participle 'composed' from Latin 'componere', where 'com-' meant 'together' and 'ponere' meant 'to put/place'.

'aluminium-composed' was formed in modern English by combining the element name 'aluminium' (which entered English in the early 19th century from New Latin) and the participle 'composed' (from Latin 'componere' via Old French), producing a descriptive compound meaning 'made of aluminium'.

Initially, 'aluminium' referred specifically to the chemical element and 'composed' to being put together; over time the compound came to be used adjectivally to mean 'made of aluminium' or 'consisting mainly of aluminium'.