Definition

Noun: A cwm is a steep-walled, semicircular or bowl-shaped hollow or basin found on a mountainside, typically formed by glacial erosion. It often contains a small lake, known as a tarn.

Usage

The word cwm is a specific geographical term used in geology and physical geography. It describes a distinct landform created by past glacial activity.

Examples

• The hikers rested by the tranquil lake in the high cwm.
• Glaciers carved out the deep cwm thousands of years ago.
• The map showed a classic cwm on the northern face of the mountain.

Advanced Usage

• In Glacial Geomorphology: A cwm (also called a cirque in some regions) is a key feature in identifying past glacial landscapes. It is the starting point where a glacier originally formed.
  • Example: The series of cwms along the ridge provided clear evidence of the valley's glacial history.

Variants and Related Words

• Cirque (noun): A direct synonym for cwm, more commonly used in North American English.
• Corrie (noun): Another synonym, frequently used in Scottish geography.
• Tarn (noun): The small lake that often forms at the base of a cwm.

Synonyms

• Cirque
• Corrie

Notes on Meaning

The word cwm originates from Welsh, reflecting its common use in describing the landscapes of Wales and other parts of the UK. It is a very precise term with no significant figurative or idiomatic uses. Its meaning is consistently tied to this specific geological feature.

Noun

1. a steep-walled semicircular basin in a mountain; may contain a lake