'egg-shaped' originates from the combination of 'egg' and 'shape', where 'egg' refers to the oval object laid by birds and 'shape' refers to the form or outline of an object.

'egg-shaped' evolved from the Middle English word 'egge' and the Old English word 'sceap', eventually becoming the modern English word 'egg-shaped'.

Initially, it meant 'having the form of an egg', and this meaning has largely remained the same in modern usage.