'pot-shaped' originates from English, a compound of 'pot' and the formative '-shaped', where 'pot' meant 'a vessel' and '-shaped' meant 'having the shape of'.

'pot' changed from Old English 'pott' (and related West Germanic forms) into the modern English 'pot'; the combining form '-shaped' developed from the noun 'shape' (Old English 'gesceap'/'sceap') with a participial/adjectival suffix to form compounds like 'X-shaped'.

Initially 'pot' referred simply to 'a vessel'; when combined as 'pot-shaped' it came to mean 'having the shape of a pot', a descriptive compound whose meaning is transparently derived from its parts.