DICTIONARY OF AVIATION
��diver 'dai-vaz n. a bird which habitually dives, as a grebe,
loon, or penguin; a diving bird. dizzy 'dizi adj. having, or causing a whirling feeling or ver-
tigo; giddy: as, a *dizzy height, a *dizzy flight, a *dizzy
peise, a *dizzy mist. doldrum 'deldram n. (seatterm) a region in which ships are
specially liable to be becalmd.
equatorial doldrums, the region of calms and light baf-
fling winds near the equator, where the tr.adewinds meet
and neutralize each other. double 'dAbal intr. go or fly back; return: as, to *double en
one's course. double-decked /iAbal'dekt, (assumptivly) 'dAbal/lekt adj.
[also spelt doubletdeckt] furnisht with, or consisting essen-
tially ef, two decks or planes, one above the other, as a bi-
plane flyer or horizontal rudder; having two parallel super-
posed aeroplanes or aerofoils. double-decker ,dAbal'dek3z n. an airship which has two
decks or planes, one above the other, as a biplane; an aero-
plane flying^machine having two parallel superposed aero-
foils. double-sailing 'dAb3l,see-hrj adj. sailing in a double or
twofold way, because of having two aeroplane sustain-
ing^surfaces insted of one. double-surface 'dAb9l,SBzfis adj. having two sustaining?
surfaces, as a biplane; double?deckt ; double^surfaced. double-surfaced ^dAbal'sozfist, (assumptivly') 'dAba^sezfist
adj. furnisht with two sustaining^surfaces, as a biplane;
double^surf ace ; double^deckt : distinguisht from singlefsur-
faced. double-vaned 'dAba^veend adj. having two vanes or blades,
as a screw propeller. double-winged 'dAbal/wind adj. [also spelt doublefwingd]
having two wings or aeroplanes, one above the other : said
of flying^machines ; double^deckt. down-draft 'daun,dra:ft n. [also spelt down-draught] a
downward draft of air; a descending air^current. downfall 'daon,fc:l n. the action of falling; a sudden
descent, accidental or intentional; a stuooping down. down-feather 'daon,fe69^ n. [also spelt downzf ether] one
of the fuzzy fethers, usually small, constituting the down or
fine soft under plumage of swans, ducks, etc.; a plumule. downpour 'daon,po:^ n. [also spelt downtpour] a pouring
down of rain; a hevy continuous fall of rain. downshoot 'daun^out n. a downward or sharp quick descent
thru the air; a swoop.
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