lituus /litˈū-əs/

1. An augur's curved staff (historical)
2. A J-shaped Roman trumpet (historical)
3. A curve of similar form with the polar equation r² θ = a (mathematics)

• billfold
• billfolds
• billhead
• billheads
• billhook
• billhooks
• billiard
• billiard ball
• billiard balls
• billiard cloth
• billiard cloths
• billiard cue
• billiard cues
• billiard-marker
• billiard-markers
• billiards
• billiard table
• billiard tables
• billie
• billies
• billing
• billings
• billingsgate
• billingsgates
• Billings method