'usually-formed' originates from the combination of 'usually' and 'formed', where 'usually' means 'in the customary or expected manner' and 'formed' means 'having a particular shape or structure'.

'usually' and 'formed' have been used in English since the Middle Ages, with 'usually' deriving from the Latin 'usualis' and 'formed' from the Latin 'formare'.

Initially, 'usually-formed' meant 'shaped in the common way', and this meaning has largely remained the same in modern usage.