petrify
verbUK /ˈpɛtrɪfaɪ/
US /ˈpɛtrəˌfaɪ/
To turn into stone over a very long time.
The fallen tree slowly petrified and became hard as rock.
OTHER MEANINGS
2. To make someone so frightened that they cannot move.
The loud scream petrified the little boy.
3. To become stiff or fixed like stone.
Her face petrified into a mask of shock.
4. To change organic material into a stony substance through mineral replacement.
The ancient bones were petrified by minerals in the water.