The flat stone at the bottom of a row of columns in a building.
Stylobates are important for holding up the columns in a building.
Examples:
The stylobates in the old building were made of marble.
The workers carefully placed the columns on the stylobates.
The stylobates were strong and wide.
The little mouse ran under the stylobates and hid.
The stylobates were so long, they reached from one side of the room to the other.
The stylobates were as smooth as ice.