Related Clues:

• It's a gas!
• Preoperative delivery of old
• It'll knock you out
• Once-popular anesthetic
• Send up
• Old number?
• Old-time anesthetic
• ___ blue
• It could knock you out
• Bygone anesthetic
• Place for an ace
• Upper region of space
• Anesthetic of old
• It puts people out
• Where the sun sets