Possible Questions:
- Old anesthetic
- Light gas
- Heavens
- It's a gas
- Wild blue yonder
- Old-time anesthetic
- Clear sky
- Bygone anesthetic
- Early anesthetic
- Solvent
- Anesthetic
- Former anesthetic
- Common solvent
- The heavens
- Book of Mormon book
- Upper regions
- Upper regions of space
- Anesthetic gas
- The clear sky
- Anesthetic of old
- It'll knock you out
- Erstwhile anesthetic
- Astronaut's milieu
- Sky
- Old number?
- Operating room substance, once
- Once-popular anesthetic
- Antiknock additive
- Anesthetic of yore
- Anesthesia of old
- An anesthetic
- Upper space
- Upper atmosphere
- Preoperative anesthetic of old
- Old-style anesthetic
- It's a knockout
- Heady stuff
- Chloroform cousin
- Volatile solvent
- Upper region of space
- The wild blue yonder
- Standard anesthetic, once
- Pre-op inhalant, once
- Old operating room substance
- It's a gas!
- It can knock you out
- Inhalation anesthetic, once
- Heavenly space
- Cyberspace
- Chloroform kin
- Upper air
- Procaine predecessor
- Preoperative delivery of old
- Old sleep-inducer
- Old sleep inducer
- Old operating-room substance
- Obsolete anesthetic
- Heavens, poetically
- Flammable solvent
- Compound number?
- Certain anesthetic
- Aromatic solvent
- Wide blue yonder
- Upper sky
- The wide blue yonder
- The sky
- Pre-Novocain stuff
- Outer space
- Outdated anesthetic
- Onetime anesthetic
- Old sleep aid?
- Old knockout agent
- Number no longer used
- Novocain predecessor
- Knockout gas
- Kin of chloroform
- It's a real knockout
- It can put you out
- Flammable anesthetic
- Empyrean
- Early number?
- Early anesthesia
- Cousin of chloroform
- Cosmos
- Chloroform substitute
- Aristotle's "fifth element"
- Air beyond the clouds
- A great composer?
- Who "In the ___"
- What a knockout!
- Welsh alt-rock band
- Upper regions of space, poetically
- Upper regions of space, figuratively
- Upper reaches of space
- Upper places in space
- This could put you under
- There was a time it could knock you out
- The far-blue yonder
- Space, to poets
- Space out yonder
- Solvent for resins and fats
- Rarefied air
- Rare air
- Preparation for drilling?
- Preoperative delivery, once
- Potent anesthetic
- Passé gas
- Passé anesthetic
- Part of the gasoline additive M.T.B.E.
- Outmoded anesthetic
- Outer regions of space
- Outer region of space
- Out-of-use anesthetic
- Onetime dental anesthetic
- One-time labratory solvent
- One-time anesthetic
- One on it may be out of it
- Old-timey anesthetic [need a holiday gift? avxwords.com annual subscriptions are just $15]
- Old-time knockout gas
- Old-time knockout
- Old-fashioned anesthetic
- Old under-taker
- Old surgery aid
- Old sleeping aid?
- Old pre-op inhalant
- Old number
- Old knockout fumes
- Old knockout cause
- Old hospital supply
- Old hospital administration
- Old anaesthetic
- Number that's no longer used
- Number that might be used when counting backward from 100?
- Number no longer used?
- Nitrous oxide predecessor
- Laughing-gas kin
- Knockout number?
- Knockout choice, once
- Knock-out gas, once
- It's a gas?
- It puts people out
- It put people to sleep, once
- It could knock you out
- It can knock people out
- Inhaled anesthetic of old
- Inhalation anesthetic of old
- Inhalant anesthetic of the past
- Former number?
- Flammable liquid
- Fifth element, per Aristotle
- Fifth classical element
- Ethyl oxide
- Early surgery aid
- Dr. Morton's anesthetic
- Dr. Larch's drug in "The Cider House Rules"
- Discovery of a Spanish chemist in 1275
- Dioxane, e.g.
- Dimethyl ___ (aerosol propellant)
- Dentist's supply, once
- Dentist's gas
- Dental anesthetic of old
- Composition of outer space, in old belief
- Colorless liquid
- Clear blue sky
- Chloroform's predecessor
- Chloroform's cousin
- C4H10O
- BBC realm
- Aromatic liquid formerly used as an anesthetic
- Anesthetic, formerly
- Anesthetic liquid
- Anaesthetic
- Airwaves
- Air up there
- Air or heavens, to a poet
- Air beyond the clouds, poetically