matterock
nounUK /ˈmætərɒk/
US /ˈmætərɑːk/
A matterock is a big rock that is made of matter.
The scientist studied the matterock to learn what it was made of.
OTHER MEANINGS
2. A heavy lump of solid material found in space.
The astronauts spotted a matterock drifting near the moon.
3. A stubborn problem that is hard to solve.
Fixing the old bridge turned into a real matterock for the town.
4. A large piece of rock used in building.
They hauled a matterock to the site to use as a foundation stone.