Page:Dictionary of aviation.djvu/56

 32 DICTIONARY OF AVIATION

atmospheric ,3etni9s'fezik adj. [also spelt atmosferic] ef or pertaining to the atmosfere or air; aerial.

atmospherical ^tmas'fezi-kal adj. [also spelt atmosferical] same meaning as atmospheric.

atmospherically ^Imas'fezika-h adv. [also spelt atmos- ferically] with respect to the atmosfere; as regards air? conditions.

atmospherology ^tmasfi'zete-dsi n. [also spelt atmosfe- rology] the science of the atmosfere.

attitude 'aeti,tc.ud n. a posture or disposition of the parts of an aerofoil relativ to the direction of flight; the position of an aeroplane about a transverse horizontal axis, compare aspect.

ground attitude, the attitude, posture, or angle of inci- dence of the aerofoils of a flying^machine while standing on the ground : distinguisht from j 'lying* attitude.

aureola c'zii-9-la n. a luminous emanation, ring, halo, or cloud radiating from, or surrounding, a figure or an object; an anthelion; a glory; an aureole.

aureole 'c'.-zi-ol n.

1. a luminous emanation, ring, halo, or cloud radiating from, or surrounding, a figure or an object, such as ob- servd, for example, around an electric arc produced in a vacuum; an aureola.

2. (in meteorology) the ring of luhite light about ttuelv degrees wide, with a ruddy border, sometimes seen around the sun or moon.

3. (in astronomy) the ring of light seen around the sun or moon in total eclipses of the sun.

aurora c'zo:-z9 n.

1. the rising light of the morning; the dawn.

2. a luminous radiation, probably of electrical character, originating in the vicinity of the earth's northern (or southern) magnetic pole, visible from time to time by night, in the hevens, especially toward the northern or southern part of the sky; aurora borealis; northern (or southern) lights; merry^dancers ; streamers.

aurora australis, the aurora of the southern sky; the southern lights.

aurora borealis, the northern lights.

auroral c'zor-zsl adj. ef or pertaining to the aurora, or to auroras: as, *auroral arch, *auroral beams, *auroral corona, ^auroral distribution, *auroral flashes, *auroral needles, auto-balloon 'c:-to-b3,}oun n. a small dirigible balloon for ordinary purposes; a Hghter^than^air flyabout.
 * auroral period, *auroral periodicity, *auroral waves.

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