botulinum A toxin

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botulinum A toxin (bot-yoo-ly-nŭm) n. a powerful nerve toxin, produced by the bacterium Clostridium botulinum, that is injected, in minute dosage, for the treatment of various conditions of muscle dysfunction, such as dystonia (including blepharospasm and torticollis) and spastic paralysis associated with cerebral palsy. Trade names:. Botox,. Dysport.