noctilucent
/ˌnɑktɪˈlusənt/
adjective
- Describing clouds that shine at night, especially very high clouds that reflect sunlight after sunset.
- Scientists study noctilucent clouds to learn about the upper atmosphere.
- We stayed up late hoping to see the rare noctilucent clouds after the sun went down.
- Noctilucent clouds appear as glowing silver-blue streaks in the summer night sky.
Antonyms