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)

• airframes
• air freight
• air-freight
• air-freighted
• air-freighting
• air freights
• air-freights
• air frost
• airgap
• airgaps
• air-gas
• airglow
• airglows
• airgraph
• airgraphs
• air-grating
• air-gratings
• air guitar
• air guitars
• airgun
• airhead
• airheads
• air hockey
• airhole
• airholes