aircraft that fly without engines by using air currents and gravity; or people or animals that glide; or a type of furniture that rocks gently back and forth.
From Old English 'glidan' meaning 'to slide or slip.' The '-er' suffix means 'one who does' the action. Became specialized for engineless aircraft and furniture.
Glider pilots use invisible columns of rising air called 'thermals' to stay aloft for hours without engines—they're basically reading the invisible architecture of the sky like sailors read water currents.
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