changing location rapidly | an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant |
a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression | dry mash for poultry |
a rate (usually rapid) at which something happens | |
the ratio of the focal length to the diameter of a (camera) lens system | |
distance travelled per unit time | |