Related Clues:

• Upper regions of space
• Antiknock agent
• It can knock people out
• Heavenly space
• Old operating room substance
• A number of people?
• Potent anesthetic
• Numbing agent
• Volatile solvent
• Anesthetic
• Outdated anesthetic
• It can knock you out
• Old sleep-inducer
• Old antiknock fuel
• Number no longer used