1. Plural of ghyll; narrow valleys or ravines, especially in northern England, often with a stream running through them.
Usage: chiefly British; regional (Northern England, Lake District)

Examples

• The hikers explored several ghylls in the Lake District.
• Water cascaded down the rocky ghylls after the heavy rain.
• The narrow ghylls provided shelter from the wind.
• Local maps marked several ghylls as popular walking routes.
• Moss and ferns grew abundantly in the damp ghylls.