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Douglas Harper's Etymology Dictionary

1853, from Welsh cwm "coomb" (see coomb).


n. A valley head created through glacial erosion and with a shape similar to an amphitheatre.


n. a steep-walled semicircular basin in a mountain; may contain a lake [syn: cirque, corrie]


Cwm may refer to:

  • Cwm (landform), a rounded, glaciated valley, also known as a corrie or cirque
  • Cwm (software), a general-purpose data processor for the semantic web
  • Cwm railway station, a station in Cwm, Blaenau Gwent, Wales, 1852–1963
  • Cwm Rhondda, a famous Welsh hymn tune
Cwm (software)

Cwm (pronounced koom) is a general-purpose data processing software for the semantic web, similar to sed or awk for text files or XSLT for XML. It is a forward chaining semantic reasoner that can be used for querying, checking, transforming and filtering information. Its core language is RDF, extended to include rules, it can use RDF/XML or RDF/ N3 (see Notation3 Primer) serializations.

cwm can perform the following tasks:

  • Parse and pretty-print the following RDF formats: XML RDF, Notation3, and N-Triples.
  • Store triples in a queryable triplestore (a triples database).
  • Perform inferences as a forward chaining FOPL inference engine.
  • Perform builtin functions such as comparing strings, retrieving resources, all using an extensible builtins suite.

cwm was written in Python from 2000-10 onwards by Tim Berners-Lee and Dan Connolly of the W3C.

Cwm (window manager)

cwm (Calm Window Manager) is a stacking window manager for the X Window System. While it is primarily developed as a part of OpenBSD's base system, portable versions are available on other Unix-like operating systems.

Usage examples of "cwm".

As she jogged along, the dark line of mountains that separated Yr Auddglyn from the province of Cwm Peel loomed closer and closer, like clouds on the horizon.

Once they were through, the danger would lessen, because Blaen, Gwerbret Cwm Peel, kept patrols of riders on his side of the mountains.

Beside the road was a rough-cut stone pillar carved with a rearing stallion, the blazon of the gwerbrets of Cwm Peel.

At a fast trot, the warband turned around the bend in the road, twenty men, mailed, mounted on good horses, and on their shields was the red and gold blazon of Cwm Peel.

We men of Cwm Peel hate horse thieves the worst of all the thieves in the world.

Quickly the hills fell away behind her, and she was in the rolling meadowlands of Cwm Peel.

Probably you know that I rode a message for his grace from the Cwm Peel pass.

All Sarcyn could do was hope that the Great Stone of the West was lying in the mud of the Cwm Peel pass.

When the word got out that Rhodry had turned the king and the prince of the Cwm Peel guild over to the gwerbret, how long do you think your lad would have lived?

She must have blushed, but no moonlight came into deep Cwm Isaf and so I could not see her face, but only feel the pressure of her fingers in mine.

That morning, waking to my first dawn in Cwm Isaf, I had seen a martin fly away from the thatch.

I went to see the house where his mother had been given shelter after Uther had rejected her and found it to be an earth-walled hall about the same size as our house in Cwm Isaf.

I hid the gold in a pouch and, once back at Cwm Isaf, I took the scrap of gold and the two warrior rings to a metalworker there and watched as he melted and fashioned the gold into two crosses that he burned onto the iron.

I thought Arthur was about to make some comment comparing my present humble state with my future wealth and I was ready to defend Cwm Isaf against such a comparison, but instead he looked rueful.

Arthur and I walked up the cwm where he admired the newly-pleached hedges, the trimmed apple trees and the small fish pool we had dammed into the stream.