The joint connecting the hand and forearm, or a band worn around this area.
Compound of 'hand' and 'wrist' (from Old English 'wriest'), though 'wrist' alone became standard; this compound form is archaic or dialectal.
Most compound body-part terms like 'handwrist' were eventually simplified to just the more specific word—'wrist' won out over 'handwrist' because it's more precise, showing how language naturally prunes redundant descriptors.
Complete word intelligence in one call. Free tier — 50 lookups/day.