I tend not to think of words like this as, well, words. Instead, I think of them as abbreviations or as, indeed, prefixes. On the other hand, the definition and the usage clearly indicates that it is a word as well as an abbreviation.aero, a.[Abbrev.]a. colloq. Aerodynamic, streamlined: used chiefly with reference to motor vehicles.b. … Continue reading Not just a prefix any more!