1. A weedy perennial with tough wiry stems and purple flowers; native to Europe but widely naturalized
   - lesser knapweed, black knapweed, hardheads

Type of: knapweed

• bilby
• bildungsroman
• bile
• bile acid
• bile duct
• bile salt
• bilestone
• bilge
• bilge keel
• bilge pump
• bilge well
• bilges
• bilgewater
• bilgy
• bilharzia
• bilharziasis
• biliary
• biliary ductule
• bilimbi
• bilinear
• bilingual
• bilingual dictionary
• bilingualism
• bilingualist
• bilingually