amphetamine: a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression
drug of abuse: a drug that is taken for nonmedicinal reasons (usually for mind-altering effects); drug abuse can lead to physical and mental damage and (with some substances) dependence and addiction
lumbar vertebra: one of 5 vertebrae in the human vertebral column; lumbar vertebrae extend from the twelfth thoracic vertebra down to the sacral vertebrae