1. A plant of the genus centaurea.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• jnapweed,
• mnapweed,
• lnapweed,
• onapweed,
• inapweed,
• kbapweed,
• kmapweed,
• kjapweed,
• khapweed,
• knzpweed,
• knspweed,
• knapeweed,
• knapweeed,
• knapwweed,
• knapwdeed,
• knapeed,
• knawpeed,
• Napeweed,
• Napweeds,
• Kneapweed

The adjective form of the word "knapweed" is "knapweedish".

The plural of the "knapweed" can be the "knapweeds".

The singular of the "knapweed" can be the "knapweed".