n. 抽出, 取出, 拔出术, 抽出物

[化] 萃取; 提取

[医] 摘出术, 拔出, 取出, 浸出, 提取法

[经] 榨取

Extraction \Ex*trac"tion\, n. [Cf. F. extraction.]
1. The act of extracting, or drawing out; as, the extraction
of a tooth, of a bone or an arrow from the body, of a
stump from earth, of a passage from a book, of an essence
or tincture.

2. Derivation from a stock or family; lineage; descent;
birth; the stock from which one has descended. ``A family
of ancient extraction.'' --Clarendon.

3. That which is extracted; extract; essence.

They [books] do preserve as in a vial the purest
efficacy and extraction of that living intellect
that bred them. --Milton.

{The extraction of roots}. (Math.)
(a) The operation of finding the root of a given number or
quantity.
(b) The method or rule by which the operation is
performed; evolution.