Definition of rock basin in US English:

rock basin

noun

  • A basin-shaped hollow in rock, especially one of natural origin; (Geomorphology) a large depression in a rocky area that was formed by glacial erosion and is commonly filled by a lake.

Origin

Mid 18th century; earliest use found in William Borlase (1696–1772), antiquary and naturalist. From rock + basin.

Pronunciation

rock basin

/ˌrɒk ˈbeɪsn/