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What is "the extraction of roots"

The Collaborative International Dictionary
The extraction of roots

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.)

    1. The operation of finding the root of a given number or quantity.

    2. The method or rule by which the operation is performed; evolution.