1. A contorted knot in wood; a cross-grained protuberance; a nodule; a boss or projection
   - knurl 
2. A knot in wood; a protuberance
   - knag

Derived forms: knurs

• cycad
• cycad family
• Cycadaceae
• Cycadales
• Cycadofilicales
• Cycadophyta
• Cycadophytina
• Cycadopsida
• Cycas
• Cycas circinalis
• Cycas revoluta
• Cyclades
• Cycladic civilisation
• Cycladic civilization
• Cycladic culture
• cyclamate
• cyclamen
• Cyclamen hederifolium
• Cyclamen neopolitanum
• Cyclamen purpurascens
• cycle
• cycle of rebirth
• cycle on
• cycle path
• cycle per second