'irregular-fingered' originates from the combination of 'irregular' and 'fingered', where 'irregular' means 'not regular' and 'fingered' refers to having fingers.

'Irregular' comes from the Latin word 'irregularis', and 'fingered' is derived from the Old English 'finger'.

Initially, 'irregular' meant 'not following a rule', and 'fingered' referred to having fingers. The combined term 'irregular-fingered' has maintained its meaning of having non-uniform fingers.