Definition of "aero"

aero

/ˈɛəɹəʊ/

adjective
comparative more aero, superlative most aero
1. (not comparable) Of or pertaining to aviation.
  Quotations
  According to aero experts these planes will be capable of carrying six passengers, five machine guns, a special rapid fire aerogun and about fifty bombs, and will be practically immune from injury due to attacks by the light battleplanes […]
  1918, Illustrated World, volume 29, number 3, page 406
2. Aerodynamic; having an aerodynamic appearance.
noun
countable and uncountable, plural aeros
1. (slang, uncountable, motor racing) Aerodynamics.
  Quotations
  "The biggest difference is aero, which is a really big cut."
  2009 February 12, Paul Gover, “Australian Grand Prix sleep-in suits Robert Kubica,”, in Herald Sun‎
2. (informal, countable, dated) An airplane or airship.
3. (uncountable) Aerospace.