Pronunciation: (glī'dur),[key] —n. 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.