aero,a.|ˈɛərəʊ|[Abbrev.]a.colloq.Aerodynamic, streamlined: used chiefly with reference to motor vehicles.1988Bicycle Guide Mar. 70/2He wears an aero helmet and uses a streamlined wheel.Ibid.70/3His new aero bike makes an additional half-minute improvement.1989Sunday ExpressMag.17 Sept. 21/2Five years earlier, Heffernan had gone to Audi in Germany, where he contributed to the current Audi 100, a benchmark in the 80s ‘aero’ style.1991Harper'sMag.May 22/2For 1991 Dodge Caravan and Plymouth Voyager have a lower, more aero front end.1992New Republic 18 May 12/1 (Advt.),We lowered the front end for more visibility, and softened the lines for a more aero look.b.Comb.aero bar Cycling, an attachment to or replacement for the handlebars of a racing bicycle, allowing the cyclist to adopt a more aerodynamic, forward-sitting posture.1988Bicycling May 202/3 (caption)Aero bars can cut more than a minute from a 25-mile time trial.1992Bicycle Feb. 59/2,I wanted to make a bike that is really comfy in the drops (handlebars) and also when the rider is stretched out on the aero bars.