Related Clues:

• Anesthetic of old
• It puts people out
• Obsolete anesthetic
• Procaine predecessor
• Airwaves
• Composition of outer space, in old belief
• Old hospital administration
• Number
• Thin air
• Anesthesia of old
• Knock-out gas, once
• Old sleep inducer
• Upper regions
• Old-style anesthetic
• Flammable liquid