'stably-formed' originates from the combination of 'stable' and 'formed', where 'stable' comes from Latin 'stabilis', meaning 'firm' or 'steadfast', and 'formed' from Latin 'formare', meaning 'to shape'.

'stabilis' transformed into the Old French word 'stable', and 'formare' into the Old French 'former', eventually becoming the modern English words 'stable' and 'form'.

Initially, 'stable' meant 'firm or steadfast', and 'form' meant 'to shape', which together evolved into the meaning of 'having a stable or consistent structure'.