A rigid or semi-rigid circular support worn around the arm, or possibly a ring-shaped piece of decorative or functional armwear.
Compound of 'arm' (the limb) and 'hoop' (a circular band), likely a historical or archaic term for a bracelet-like or circular armband structure.
While 'armhoop' is quite rare in modern English, similar ring or band structures on arms appear across cultures—from Roman bracelets to Celtic torcs—showing how humans have always liked wearing decorative circles around limbs.
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