mysteryelement
nounUK /ˈmɪstəri ˈɛlɪmənt/
US /ˈmɪstəri ˈɛləmənt/
A mystery element is a secret part of a story that makes you wonder what will happen next.
The locked door was the mystery element that kept everyone guessing until the last page.
OTHER MEANINGS
2. An unknown part of a scientific problem that scientists are still trying to figure out.
The strange signal from space became the mystery element in their research.
3. A surprising feature in a game or puzzle that players must discover.
The hidden room was the mystery element that made the game exciting.
4. Something in a recipe or mixture that is kept secret.
Grandma's cookies had a mystery element that nobody could guess.