stratosphere
UK: ˈstræt.ə.sfɪər | US: ˈstræt̬.ə.sfɪr
n. The layer of the Earth's atmosphere above the troposphere, extending from about 10 to 50 km above the surface, characterized by stable temperatures and the presence of the ozone layer.
n. (Figuratively) A very high or elite level of activity or achievement.
The word "stratosphere" combines "strato-" (from Latin stratum, meaning "layer" or "spread out") and "-sphere" (from Greek sphaira, meaning "globe" or "ball"). It was coined in the early 20th century to describe the atmospheric layer that lies in a stratified, stable state above the turbulent troposphere. The term reflects its scientific logic: a layered ("strato") global ("sphere") region of the atmosphere.
The ozone layer is located in the stratosphere, protecting life on Earth from harmful ultraviolet radiation.
Commercial jets typically fly in the lower stratosphere to avoid weather disturbances.
Her talent in mathematics placed her in the stratosphere of academic achievers.
Scientists study temperature inversions in the stratosphere to understand climate patterns.
The stratosphere's calm conditions make it ideal for high-altitude balloon experiments.