Real Dictionary

aerothermodynamics in American English
the study of the relationship of heat and mechanical energy in gases, esp. air
noun: aerodynamics dealing with conditions where there are significant heat exchanges in gases or significant thermal effects between gas and solid surfaces, as in very high-speed, generally supersonic flight

aerothermodynamics in British English
noun: the study of the exchange of heat between solids and gases, esp of the heating effect on aircraft flying through the air at very high speeds