Definitions

1. noun

The bottom or base of a river, especially where the current is slow and the water is shallow, often composed of gravel, sand, or rocks.

“The hikers had to cross the riverbed to reach the other side.”

2. noun

A layer or deposit of gravel, sand, or rocks at the bottom of a river, often formed by the erosion of the surrounding land.

“The riverbed was lined with smooth rocks that had been polished by the water.”