DICTIONARY OF AVIATION 259
apex or tip^end of the longest primary of the wing; the
��posterior wing, (in entomology") one of the hinder or under pair of wings of an insect which has two pairs of wings; a hind^wing; a metathoracic wing; an inferior wing.
reversed wings, (in entomology") wings which in repose are deflext, the upper wings lying closer to the body of the insect than the lower ones, which project beyond their an- terior margins, as in certain lepidepters.
root of the wing, the part or end of the wing toward the bird's shoulder.
spurious wing, the winglet or alula of a bird's wing; the bastard wing; the ala spuria.
stretch of the wings, same meaning as stretch of wing.
stretch of wing, the distance or mesurement from tip to tip of the outspred wings of a bird or insect; expanse or extent of wing; alar expanse; alar extent; wing^spred (sense i).
superior wing, (in entomology} one of the anterior wings of an insect which overlie or fold over the posterior ones; an upper or fore wing.
tail of the wing, (in entomology} one of the long slender backward prolongations of the wing of an insect, as a but- terfly or meth.
take wing, take flight; make wing; depart.
tectiform wings, (in entomology) roof^shaped wings; wings which are held sloping like the roof of a house when the insect rests.
thoracic zving, (in entomology} a wing borne upon the thorax of an insect; a metathoracic or mesothoracic wing.
tumid wing, (in entomology) a wing in ichich the mem- brane of every cell is larger than the cell itself, so that the membrane projects slightly, as in the saw-flies.
under wing, (in entomology) one of the inferior wings of an insect; a posterior wing.
unequal wings, (in entomology) wings of tuhich the an- terior and posterior pairs are of unequal length, the anterior pair being in this case usually the longer.
upper wing, (in entomology} one of the superior wings, of an insect; an anterior wing.
vertical wings, same meaning as erect wings.
2. an artificial structure resembling a natural wing in form or function, designed for aerial sustentation or flight; one of the sustaining^surfaces, or sets of sustaining^sur- faces or sails, on either side of the axis of flight, or of the
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