Botox meaning : 1. a brand name for a substance that is injected (= put in through a needle) into the skin in order…. Learn more. Botulinum toxin, or botulinum neurotoxin (commonly called botox ), is a neurotoxic protein produced by the bacterium Clostridium botulinum and related species. [23] It prevents the release of the neurotransmitter acetylcholine from axon endings at the neuromuscular junction, thus causing flaccid paralysis. [24] The toxin causes the disease botulism. [25] The toxin is also used commercially for medical and cosmetic purposes. [26][27] Botulinum toxin is an acetylcholine release inhibitor and a ... Botox definition : 1. a brand name for a substance that is injected (= put in through a needle) into the skin in order…. Learn more. Trademark a preparation of botulinum toxin used to treat muscle spasm and to remove wrinkles.... Click for English pronunciations, examples sentences, video.