'forearm-related' originates from the combination of 'forearm' and the suffix '-related', where 'forearm' refers to the part of the arm between the elbow and the wrist, and '-related' indicates a connection or association.

'forearm' comes from Old English 'forearm', and '-related' is derived from Latin 'relatus', meaning 'brought back'.

Initially, it meant 'connected to the forearm', and this meaning has largely remained the same in modern usage.