glider

[glahy-der]
noun
1.
a motorless, heavier-than-air aircraft for gliding from a higher to a lower level by the action of gravity or from a lower to a higher level by the action of air currents.
2.
a porch swing made of an upholstered seat suspended from a steel framework by links or springs.
3.
a person or thing that glides.
4.
a person who pilots a glider.

Origin:
1400–50; late Middle English; see glide, -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
glider (ˈɡlaɪdə)
 
n
1.  See also sailplane an aircraft capable of gliding and soaring in air currents without the use of an engine
2.  a person or thing that glides
3.  another name for flying phalanger

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Maybe a reasonable high-to low glider, which would suggest pouncing on birds
  that are on the ground.
The largest bird that ever flew was an expert glider but was too heavy to fly
  by flapping its wings, researchers say.
The paradise tree snake is one of the smaller flying snakes and the best glider.
In theory, this sea glider could travel for thousands of kilometres on voyages
  that could last for years.
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