1. (n.) Any substance in the gaseous, or aeriform, state, the condition of which is ordinarily that of a liquid or solid.

2. (n.) In a loose and popular sense, any visible diffused substance floating in the atmosphere and impairing its transparency, as smoke, fog, etc.

3. (n.) Wind; flatulence.

4. (n.) Something unsubstantial, fleeting, or transitory; unreal fancy; vain imagination; idle talk; boasting.

5. (n.) An old name for hypochondria, or melancholy; the blues.

6. (n.) A medicinal agent designed for administration in the form of inhaled vapor.

7. (n.) To pass off in fumes, or as a moist, floating substance, whether visible or invisible, to steam; to be exhaled; to evaporate.

8. (n.) To emit vapor or fumes.

9. (n.) To talk idly; to boast or vaunt; to brag.

10. (v. t.) To send off in vapor, or as if in vapor; as, to vapor away a heated fluid.

Barnumize London fog London special Old Faithful air airy nothing apparition autism babble blabber blather blow bluff bluster bluster and bluff boast boiling water bombast bounce brag brainchild breathe out bubble bull bullshit bully chimera cloud daydream deception delirium deluded belief delusion depression dereism distemper draw the longbow dream dream vision dreamland dreamworld drisk drivel drizzling mist drool eidolon emit ether evacuate exhalation exhale exhaust expire false belief fancy fantasque fantasy fiction figment film flourish fog frost smoke fume gabble gas gasconade gauze geyser gibber gibble-gabble give off give out give vent to hallucination haze hector hot spring hot water hypochondria hysteria idle fancy ignis fatuus illusion imagery imagination imagining inflate insubstantial image intimidate invention jabber lay it on let out maggot make-believe misbelief misconception mist morbidity myth nervousness open the floodgates open the sluices out-herod Herod pea soup pea-soup fog peasouper phantasm phantom piffle pile it on pipe dream pontificate prate prattle puff rage rant rattle rave reek rheuminess roister rollick romance self-deceit self-deception self-delusion shadow sick fancy slang smog smoke speak for Buncombe spirit splutter sputter steam storm swagger swashbuckle talk big talk highfalutin talk nonsense the pip thermae thick-coming fancies thin air throw off trick trip twaddle twattle vaunt vision waffle whim whimsy wildest dreams wrong impression