Sailplane (noun)

1. An aircraft that is designed to fly without an engine, using rising currents of air to stay aloft, also known as gliders.
2. A type of aircraft used for sport, recreation, and scientific research that relies on the natural movement of air to stay in the sky.

Origin:

The word "sailplane" is a combination of two words "sail" and "plane", it"s also known as a glider. it"s a type of aircraft that is designed to fly without the use of an engine, instead it relies on rising currents of air, such as thermals, to stay aloft. sailplanes have been used for sport, recreation, and scientific research since the early 20th century.

Examples:

1. He was a sailplane pilot, who enjoyed the thrill of soaring through the sky.
2. The sailplane was a beautiful sight as it gracefully glided across the sky.
3. He was learning to fly a sailplane, and was getting better with each flight.
4. The sailplane was an efficient aircraft, able to stay aloft for hours with minimal fuel consumption.
5. The sailplane was a valuable tool for scientific research, providing data on weather patterns and air currents.