mysterycause
nounUK /ˈmɪstəri kɔːz/
US /ˈmɪstəri kɔːz/
A mysterycause is the secret reason why something happens.
The detective tried to find the mysterycause of the strange noise.
OTHER MEANINGS
2. A made-up word for a cause that nobody can explain yet.
The scientist wrote 'mysterycause' in her notebook next to the question mark.
3. Something that makes a mystery happen in a story.
In the book, the mysterycause was a lost key under the floor.
4. A reason that is kept secret on purpose.
The mysterycause of the surprise party stayed hidden until her birthday.