Glider

n. engineless aircraft; hang-glider; person or thing which glides

Gliders or Sailplanes are heavier-than-air aircraft primarily intended for unpowered flight. See also gliding and motor gliders for more details.
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Noun
1. aircraft supported only by the dynamic action of air against its surfaces
(synonym) sailplane
(hypernym) heavier-than-air craft
(hyponym) hang glider
(derivation) glide

(n.)
One who, or that which, glides.
  

A heavier-than-air aircraft, that is supported in flight by the dynamic reaction of the air against its lifting surfaces and whose free flight does not depend principally on an engine. (14CFR1)