The hazy gray cloud that floats in the air when something burns is smoke. Smoke is made up of tiny carbon particles. If you get lost in the woods, you can use the smoke from your campfire to guide you back to your tent — or you can just use the GPS on your smartphone.

The saying "where there's smoke there's fire” means that there's always a reason for a rumor. The saying is literally true as well—when you set something on fire, it will begin to smoke. When something "goes up in smoke," it's either destroyed by fire or ruined as though it's been burned: "My dreams of being a magician went up in smoke after that rabbit trick went awry."

Definitions of smoke
  1. noun
    a cloud of fine particles suspended in a gas
    synonyms: fume
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    gun smoke
    smoke created by the firing of guns
    a stifling cloud of smoke
    type of:
    a cloud of solid or liquid particles in a gas
  2. noun
    a hot vapor containing fine particles of carbon being produced by combustion
    “the fire produced a tower of black smoke that could be seen for miles”
    synonyms: smoking
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    type of:
    evaporation, vapor, vaporisation, vaporization, vapour
    the process of becoming a vapor
  3. verb
    emit a cloud of fine particles
    synonyms: fume
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    type of:
    emit, give off, give out
    give off, send forth, or discharge; as of light, heat, or radiation, vapor, etc.
  4. noun
    an indication of some hidden activity
    “with all that smoke there must be a fire somewhere”
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    type of:
    indicant, indication
    something that serves to indicate or suggest
  5. noun
    something with no concrete substance
    “his dreams all turned to smoke
    “it was just smoke and mirrors”
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    type of:
    lacking substance or reality
  6. noun
    tobacco leaves that have been made into a cylinder
    synonyms: roll of tobacco
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    show 10 types...
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    a roll of tobacco for smoking
    butt, cigaret, cigarette, coffin nail, fag
    finely ground tobacco wrapped in paper; for smoking
    a cigar with both ends cut flat
    small cigar or cigarette wrapped in tobacco instead of paper
    a cigar made with light-colored tobacco
    a long cigar with blunt ends
    cubeb, cubeb cigarette
    a cigarette containing cubeb
    filter-tipped cigarette
    a cigarette with a filter tip
    panatela, panetela, panetella
    a long slender cigar
    stogie, stogy
    a cheap cigar
    type of:
    baccy, tobacco
    leaves of the tobacco plant dried and prepared for smoking or ingestion
  7. noun
    the act of smoking tobacco or other substances
    synonyms: smoking
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    blowing tobacco smoke out into the air
    type of:
    breathing, external respiration, respiration, ventilation
    the bodily process of inhalation and exhalation; the process of taking in oxygen from inhaled air and releasing carbon dioxide by exhalation
  8. noun
    street names for marijuana
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    type of:
    cannabis, ganja, marihuana, marijuana
    the most commonly used illicit drug; considered a soft drug, it consists of the dried leaves of the hemp plant; smoked or chewed for euphoric effect
  9. verb
    inhale and exhale smoke from cigarettes, cigars, pipes
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    smoke one cigarette after another; light one cigarette from the preceding one
    puff, whiff
    smoke and exhale strongly
    draw deep into the lungs by breathing
    type of:
    consume, have, ingest, take, take in
    serve oneself to, or consume regularly
  10. noun
    (baseball) a pitch thrown with maximum velocity
    “he showed batters nothing but smoke
    synonyms: bullet, fastball, heater, hummer
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    a fastball that curves slightly away from the side from which it was thrown
    type of:
    delivery, pitch
    (baseball) the act of throwing a baseball by a pitcher to a batter
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