combust (combusts, present participle combusting; past and past participle combusted)

  1. To burn; to catch fire.
  2. (intransitive, figuratively) To erupt with enthusiasm or boisterousness.


  1. (obsolete) Burnt.
  2. (astrology) In close conjunction with the sun (so that its astrological influence is "burnt up"), sometimes specified to be within 8 degrees 30'.
    • 1624, Democritus Junior [pseudonym; Robert Burton], The Anatomy of Melancholy: […], 2nd edition, Oxford, Oxfordshire: Printed by John Lichfield and James Short, for Henry Cripps, OCLC 54573970 ↗:
      , I.iii.1.3:
      Guianerius had a patient could make Latin verses when the moon was combust, otherwise illiterate.


  1. (obsolete) That which undergoes burning.

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