1. A dagger mark. In old manuscripts or editions of the classics, it marks suspected passages or readings

Encyclopedia: Obelus

• air hose
• air hostess
• air jacket
• air lane
• air letter
• air marshal
• air mass
• air mattress
• Air Medal
• air mile
• Air National Guard
• air out
• air passage
• air plant
• air pocket
• air pollution
• air potato
• air power
• air pressure
• air pump
• air raid
• air reconnaissance
• air rifle
• air sac
• Air Sea Rescue