1.Being in the fourth position relative to a designated carbon atom in an organic molecule at which an atom or a group may be substituted. 2.Referring to the fourth of a group of isomers, or molecules of similar origin or properties, determined arbitrarily by those who discover or classify...
AcronymDefinition PRDAPearl River Delta Area(China) PRDAPuerto Rico Department of Agriculture PRDAProgram Research & Development Announcement PRDAPeople's Rural Development Association(Sri Lanka) PRDAPolish Racing Drivers of America(motorsports group) ...