A sedative or tranquilizer (or tranquilliser, see American and British English spelling differences) is a substance that induces sedation by reducing irritability or excitement. At higher doses it may result in slurred speech, staggering gait, poor judgment, and slow, uncertain reflexes.oses of sedatives such as benzodiazepines, when used as a hypnotic to induce sleep, tend to be higher than amounts used to relieve anxiety, whereas only low doses are needed to provide a peaceful effect.
1 Scab, a hard coating on the skin formed during the wound healing reconstruction phase.  scAb, single-chain antibody fragment.
scab. 1  the incrustation that forms over a sore or wound during healing. 2  Veterinary Pathology. a mangy disease in animals, especially sheep; scabies. 3  Plant Pathology. a disease of plants characterized by crustlike lesions on the affected parts and caused by a fungus or bacterium. one of these crustlike lesions.