76 DICTIONARY OF AVIATION
day-dawn 'dee,dc:n n. the dawn of day; daybreak.
dead ded adv. [also spelt ded] directly, exactly, straight: as, facing *ded into the wind; *ded ahed.
dead-reckoning 'ded^eka-nirj n. [also spelt dedireckoning\ the reckoning or calculation of an airship's position inde- pendently of observations of the hevenly bodies, merely by distance and direction, run, etc.
dead-water 'ded,wc:-t9z n. [also spelt dedzwater] air or other fluid without current; still air; the eddy^air or eddy^ fluid just behind the stern of an aerofoil or airship : distin- guish! from live stream, see under stream.
deadweight 'ded/weet n. [also spelt dedweight] the relativly ded or inert weight or load other than the living passen- gers, carried by a balloon; the weight of the balloon itself, as distinct from its live (or paying) weight or load.
death-blast 'de0,bla:st n. a dedly blast, as of hot gas near a volcano; a deth^dealing wind or storm.
deck dek n. one of the platferm^like horizontal planes of a biplane or multiplane; a main surface in an aeroplane flyer.
deflate di'fteet tr. release the air or gas from anything inflated, as a balloon; remove the gas from: the epposit of inflate.
deflation di'f3Lee-S9n n. the act or process of deflating; an emptying or letting out the gas from the gasbag of a bal- loon : the epposit of inflation.
deflect di'f^ekt tr. bend or turn to one side or from a straight line; change the direction of; cause to deviate from its course.
deflecting-plane di'fLektin,piLeen n. a plane or aerofoil in a flymgsmachine, used for deflecting or changing the course of the craft; a horizontal rudder; a deflector.
deflector di'ftektaz n.
1. a metal plate used to deflect or to direct the flow of air or other gas, as in aerodynamic experiments; a baffle; plate.
2. a plane or aerofoil in a flying^machine, used for de- flecting or changing the course of the craft; a deflecting? plane.
demountability di / maon-t3 / bih-ti n. the quality of being demountable.
demountable ,di'maun-t3-b3l adj. that may redily be taken apart or knockt down, for shipment, and easily reassem- bled : as, modern *demountable aeroplanes, compare col- lapsible.
density-gradient 'densiti,gzee-di-9nt n. the gradient of the
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