Related Clues:

• Knock-out gas, once
• Old sleep inducer
• Upper regions
• Word with alcohol or acetate
• Antiknock compound
• ___ alcohol
• Old antiknock gasoline
• Old-style anesthetic
• Antiknock fluid
• Flammable liquid
• Old number
• Discovery of a Spanish chemist in 1275
• Old-fashioned anesthetic
• Type of alcohol
• Volatile liquid