skycipher
nounUK /ˈskaɪˌsaɪfə/
US /ˈskaɪˌsaɪfər/
A secret code that people send through the sky.
The pilots used a skycipher to share their secret plan.
RELATED WORDS
OTHER MEANINGS
2. A pattern of clouds that some people believe carries a hidden message.
She stared at the strange skycipher above the hills.
3. A puzzle where you decode words written in the air or among the stars.
The children solved the skycipher by matching stars to letters.
4. A private way for pilots to talk to each other without others understanding.
The two planes answered each other in a quick skycipher.