The science of shaping objects so they allow the easy flow of fluids around them to reduce drag?

aer·o·dy·nam·ics   /ˌɛəroʊdaɪˈnæmɪks/ Show Spelled[air-oh-dahy-nam-iks] Show IPA

-noun ( used with a singular verb )the branch of mechanics that deals with the motion of air and other gases and with the effects of such motion on bodies in the medium. Compare aerostatics ( def. 1 ) .

-nounthe branch of fluid mechanics dealing with the properties of fluids in motion.