Resembling or having the character of chorea; characterized by involuntary, jerky, dance-like movements.
From 'chorea' plus the Latin '-form' suffix meaning 'having the form of.' Used in medicine to describe movement disorders similar to chorea.
The suffix '-form' means 'shaped like'—so a choreiform movement literally looks like a dance even though it's involuntary, which shows how the original metaphor (naming a disease after dancing) is still embedded in the medical terminology.
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