英文字典中文字典Word104.com

The Collaborative International Dictionary of English v.0.48 (gcide)

Distillation \Dis`til*la"tion\ (d[i^]s`t[i^]l*l[=a]"sh[u^]n), n.
[F. distillation, L. destillatio.]
1. The act of falling in drops, or the act of pouring out in
drops.
[1913 Webster]

2. That which falls in drops. [R.] --Johnson
[1913 Webster]

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.
[1913 Webster]

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.
[1913 Webster]

4. The substance extracted by distilling. --Shak.
[1913 Webster]

{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}.
[1913 Webster]