mysterymarker
nounUK /ˈmɪstəriˌmɑːkə/
US /ˈmɪstəriˌmɑːrkər/
A mystery marker is a special pen that writes in secret or invisible ways.
She used a mystery marker to write a hidden message to her friend.
RELATED WORDS
OTHER MEANINGS
2. A clue or sign in a game that helps players solve a puzzle.
The detective found a mystery marker on the map that led to the treasure.
3. A special bookmark that hides what page you are on.
He placed a mystery marker in his book so no one would know where he stopped reading.
4. A hidden symbol used to mark a secret spot.
The treasure map had a mystery marker showing where the gold was buried.