'arc-shaped' originates from the combination of 'arc' and 'shape', where 'arc' comes from Latin 'arcus' meaning 'bow' or 'arch', and 'shape' from Old English 'sceap' meaning 'form'.

'arc' changed from the Latin word 'arcus' and 'shape' from Old English 'sceap', eventually forming the modern English word 'arc-shaped'.

Initially, 'arc' meant 'bow' or 'arch', and 'shape' meant 'form'. Together, they evolved to describe something that has the form of an arc.