adj. of or pertaining to aeronautics or aircraft. [ PJC ]

n. [ See aerobies. ] an organism such as a microorganism that requires oxygen for life or growth. [ PJC ]

n. pl., but sing. or pl. in usage 1. physical exercises performed in a sustained and strenuous fashion designed to cause a temporary increase in respiration rate and heart rate, such a running, swimming, walking, or calisthenics. Calisthenic sessions in groups, performed by following a leader in moving to a rhythmic musical accompaniment, are a popular form of aerobics. [ PJC. ]

2. a system of physical conditioning relying largely on aerobics exercises. [ PJC. ]

n. 1. the resistance caused by a gas to the motion of a solid body moving through it. Studied in aerodynamics. [ PJC ]

n. [ Aëro- + dynamics: cf. F. aérodynamique. ] The science which treats of the air and other gaseous bodies under the action of force, and of their mechanical effects. [ 1913 Webster ]

n. [ Aëro- + Gr. &unr_; . ] (Aëronautics) a heavier-than-air aircraft; same as aeroplane. Contrasted with aerostat. [ PJC ]

n. [ Aëro- + foil. ] A plane or arched surface for sustaining bodies by its movement through the air; a spread wing, as of a bird. [ Webster 1913 Suppl. ]

n. [ Aëro- + Gr. &unr_; knowing, knowledge: cf. F. aérognosie. ] The science which treats of the properties of the air, and of the part it plays in nature. Craig. [ 1913 Webster ]

n. One versed in aëography: an aërologist. [ 1913 Webster ]

{ } a. Pertaining to aërography; aërological. [ 1913 Webster ]