De·struc·tive a.  Causing destruction; tending to bring about ruin, death, or devastation; ruinous; fatal; productive of serious evil; mischievous; pernicious; -- often with of or to; as, intemperance is destructive of health; evil examples are destructive to the morals of youth.
    Time's destructive power.   --Wordsworth.
 Destructive distillation. See Distillation.
 Destructive sorties Logic, a process of reasoning which involves the denial of the first of a series of dependent propositions as a consequence of the denial of the last; a species of reductio ad absurdum.
 Syn: -- Mortal; deadly; poisonous; fatal; ruinous; malignant; baleful; pernicious; mischievous.


 Dis·til·la·tion n.
 1. The act of falling in drops, or the act of pouring out in drops.
 2. That which falls in drops. [R.]
 3. Chem. The separation of the volatile parts of a substance from the more fixed; specifically, the operation of driving off gas or vapor from volatile liquids or solids, by heat in a retort or still, and the condensation of the products as far as possible by a cool receiver, alembic, or condenser; rectification; vaporization; condensation; as, the distillation of illuminating gas and coal, of alcohol from sour mash, or of boric acid in steam.
 Note: ☞ The evaporation of water, its condensation into clouds, and its precipitation as rain, dew, frost, snow, or hail, is an illustration of natural distillation.
 4. The substance extracted by distilling.
 Destructive distillation Chem., the distillation, especially of complex solid substances, so that the ultimate constituents are separated or evolved in new compounds, -- usually requiring a high degree of heat; as, the destructive distillation of soft coal or of wood.
 Dry distillation, the distillation of substances by themselves, or without the addition of water or of other volatile solvent; as, the dry distillation of citric acid.
 Fractional distillation. Chem. See under Fractional.

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 destructive distillation
      n : heating a solid substance in a closed container and
          collecting the volatile products