darkmatter
nounUK /ˈdɑːkˌmætə/
US /ˈdɑːrkˌmætər/
Dark matter is invisible stuff in space that we cannot see but that helps hold galaxies together.
Scientists think dark matter makes up most of the material in the universe.
OTHER MEANINGS
2. A term used in science fiction for a mysterious or powerful dark substance.
The spaceship ran on dark matter from a distant star.
3. In some games, a rare material used to build special items.
He collected dark matter to upgrade his armor.
4. A poetic way to describe something unknown or hidden.
Her past was a kind of dark matter no one could see.