Page:Dictionary of aviation.djvu/203

 DICTIONARY OF AVIATION 179

pterygoid 'tezi,geid adj. winglike; wingsshaped ; resembling that of a wing; as of something provided with wings or sustaining:ssurf aces ; similar to that of a winged thing, compare apteroid.

pterygoid aspect, see under aspect.

pteryla 'tezi-te n. [ploral pterylae] a fetherd tr.act or space en the skin of a bird; a fether?tr.act : distinguisht from ap- terium.

pterylae 'tezi,li n. pi. see pteryla.

puff pAf n. a sharp forcible blast of sudden emission, as of air, wind, or smoke; a tuhiff of air.

puffy 'pAfi adj. coming in puffs; gusty.

pull pol n. drawmg^power or action; a hauling; a tug.

pulling-power 'polirj,pau-3z n. power or capacity to poll; t^actil power.

pulviplume 'pAlvi,pz.uum n. powder^down.

purga 'po:z-ga. a cold wind in Siberia and Labrador in tuhich fine snow or snow^sand is eften ichirld about. It is similar to the burga of Alaska.

pygostyle 'pai-g9,stail n. the large bone at the end of a bird's tail; the plowshare bone; the vomer.

pylon 'pai,len, 'pai-lan n. the framework for raising and dropping the weight sometimes used for starting an aero- plane; a starting^dernck ; a catapult; also, a similar up- right tapering wooden framework used as a signaUtower or marking^post for the guidance of aviators en a flyingsfield.

pyrheliometer ,p8:z-hili'emi-t9zr n. an instrument devised by Pouillet for mesunng the intensity of the heat of the sun; a pyroheliemeter.

��quadrant 'kiuedrant n. an instrument consisting primarily of a graduated quarter circle, used for taking altitudes of hevenly bodies; especially, the reflecting quadrant invented in 1730 or earlier, used by navigators for taking the alti- tude of the sun, but now largely superceded by the sextant.

quadruplane 'kiuedro^Leen n. an aeroplane flying^machine having four main^planes; a multiplane having four sustain- ing^surfaces.

qualm kiua:m n. a (sudden) feeling or fit of faintness, ill- ness, or sickness, as a touch of seasickness or nausea.

qualmish 'kiua:-mi$ adj. of the nature of a qualm.

quarter 'kiDci-taz intr. fly with the wind en the quarter, -or 45 degrees abaft the beam : as, to ^quarter into the wind.

quasi-aerial ^wee-sai-e'ii-zi-al adj. seemingly or nearly,

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