ex·trac·tion /ɪkˈstrækʃən/ 名詞
取 萃取 擷取
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.”
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.
n 1: the process of obtaining something from a mixture or
compound by chemical or physical or mechanical means
2: properties attributable to your ancestry; "he comes from
good origins" [syn: origin, descent]
3: the act of pulling out (as a tooth); "the dentist gave her a
local anesthetic prior to the extraction"