Related Clues:

• Bygone anesthetic
• Upper region of space
• Anesthetic of old
• It puts people out
• Obsolete anesthetic
• Former gasoline additive
• Anesthetic gas
• Procaine predecessor
• Airwaves
• Composition of outer space, in old belief
• Old hospital administration
• Number
• Thin air
• Gasoline additive
• Anesthesia of old