Root of an equation
Root Root, n. [Icel. r[=o]t (for vr[=o]t); akin to E. wort, and perhaps to root to turn up the earth. See {Wort}.] 1. (Bot.) (a) The underground portion of a plant, whether a true root or a tuber, a bulb or rootstock, as in the potato, the onion, or the sweet flag. (b) The descending, and commonly branching, axis of a plant, increasing in length by growth at its extremity only, not divided into joints, leafless and without buds, and having for its offices to fix the plant in the earth, to supply it with moisture and soluble matters, and sometimes to serve as a reservoir of nutriment for future growth. A true root, however, may never reach the ground, but may be attached to a wall, etc., as in the ivy, or may hang loosely in the air, as in some epiphytic orchids. [1913 Webster]

2. An edible or esculent root, especially of such plants as produce a single root, as the beet, carrot, etc.; as, the root crop. [1913 Webster]

3. That which resembles a root in position or function, esp. as a source of nourishment or support; that from which anything proceeds as if by growth or development; as, the root of a tooth, a nail, a cancer, and the like. Specifically: (a) An ancestor or progenitor; and hence, an early race; a stem. [1913 Webster]

They were the roots out of which sprang two distinct people. --Locke. [1913 Webster] (b) A primitive form of speech; one of the earliest terms employed in language; a word from which other words are formed; a radix, or radical. (c) The cause or occasion by which anything is brought about; the source. ``She herself . . . is root of bounty.'' --Chaucer. [1913 Webster]

The love of money is a root of all kinds of evil. --1 Tim. vi. 10 (rev. Ver.) [1913 Webster] (d) (Math.) That factor of a quantity which when multiplied into itself will produce that quantity; thus, 3 is a root of 9, because 3 multiplied into itself produces 9; 3 is the cube root of 27. (e) (Mus.) The fundamental tone of any chord; the tone from whose harmonics, or overtones, a chord is composed. --Busby. [1913 Webster] (f) The lowest place, position, or part. ``Deep to the roots of hell.'' --Milton. ``The roots of the mountains.'' --Southey. [1913 Webster]

4. (Astrol.) The time which to reckon in making calculations. [1913 Webster]

When a root is of a birth yknowe [known]. --Chaucer. [1913 Webster]

{A["e]rial roots}. (Bot.) (a) Small roots emitted from the stem of a plant in the open air, which, attaching themselves to the bark of trees, etc., serve to support the plant. (b) Large roots growing from the stem, etc., which descend and establish themselves in the soil. See Illust. of {Mangrove}.

{Multiple primary root} (Bot.), a name given to the numerous roots emitted from the radicle in many plants, as the squash.

{Primary root} (Bot.), the central, first-formed, main root, from which the rootlets are given off.

{Root and branch}, every part; wholly; completely; as, to destroy an error root and branch.

{Root-and-branch men}, radical reformers; -- a designation applied to the English Independents (1641). See Citation under {Radical}, n., 2.

{Root barnacle} (Zo["o]l.), one of the Rhizocephala.

{Root hair} (Bot.), one of the slender, hairlike fibers found on the surface of fresh roots. They are prolongations of the superficial cells of the root into minute tubes. --Gray.

{Root leaf} (Bot.), a radical leaf. See {Radical}, a., 3 (b) .

{Root louse} (Zo["o]l.), any plant louse, or aphid, which lives on the roots of plants, as the Phylloxera of the grapevine. See {Phylloxera}.

{Root of an equation} (Alg.), that value which, substituted for the unknown quantity in an equation, satisfies the equation.

{Root of a nail} (Anat.), the part of a nail which is covered by the skin.

{Root of a tooth} (Anat.), the part of a tooth contained in the socket and consisting of one or more fangs.

{Secondary roots} (Bot.), roots emitted from any part of the plant above the radicle.

{To strike root}, {To take root}, to send forth roots; to become fixed in the earth, etc., by a root; hence, in general, to become planted, fixed, or established; to increase and spread; as, an opinion takes root. ``The bended twigs take root.'' --Milton. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Root of a nail — Root Root, n. [Icel. r[=o]t (for vr[=o]t); akin to E. wort, and perhaps to root to turn up the earth. See {Wort}.] 1. (Bot.) (a) The underground portion of a plant, whether a true root or a tuber, a bulb or rootstock, as in the potato, the onion …   The Collaborative International Dictionary of English

  • Root of a tooth — Root Root, n. [Icel. r[=o]t (for vr[=o]t); akin to E. wort, and perhaps to root to turn up the earth. See {Wort}.] 1. (Bot.) (a) The underground portion of a plant, whether a true root or a tuber, a bulb or rootstock, as in the potato, the onion …   The Collaborative International Dictionary of English

  • Root of unity — The 5th roots of unity in the complex plane In mathematics, a root of unity, or de Moivre number, is any complex number that equals 1 when raised to some integer power n. Roots of unity are used in many branches of mathematics, and are especially …   Wikipedia

  • root of unity — a real or complex solution of the equation xn 1 . 0 where n is an integer * * * Math. a complex number that when raised to some positive integral power results in 1 …   Useful english dictionary

  • Discriminant of an algebraic number field — A fundamental domain of the ring of integers of the field K obtained from Q by adjoining a root of x3 − x2 − 2x + 1. This fundamental domain sits inside K ⊗QR. The discriminant of K is 49 = 72.… …   Wikipedia

  • Biquadratic root of a number — Biquadratic Bi quad*rat ic, a. [Pref. bi + quadratic: cf. F. biquadratique.] (Math.) Of or pertaining to the biquadrate, or fourth power. [1913 Webster] {Biquadratic equation} (Alg.), an equation of the fourth degree, or an equation in some term… …   The Collaborative International Dictionary of English

  • Square root of 2 — The square root of 2, also known as Pythagoras constant, often denoted by:sqrt{2} or √2but can also be written as:2^{1/2},,is the positive real number that, when multiplied by itself, gives the number 2. Its numerical value approximated to 65… …   Wikipedia

  • Twelfth root of two — The twelfth root of two or sqrt [12] {2} is an algebraic irrational number, representing the frequency ratio between any two consecutive notes of a modern chromatic scale in equal temperament; that is, the interval of a semitone.Its decimal value …   Wikipedia

  • Root — Root, n. [Icel. r[=o]t (for vr[=o]t); akin to E. wort, and perhaps to root to turn up the earth. See {Wort}.] 1. (Bot.) (a) The underground portion of a plant, whether a true root or a tuber, a bulb or rootstock, as in the potato, the onion, or… …   The Collaborative International Dictionary of English

  • Root and branch — Root Root, n. [Icel. r[=o]t (for vr[=o]t); akin to E. wort, and perhaps to root to turn up the earth. See {Wort}.] 1. (Bot.) (a) The underground portion of a plant, whether a true root or a tuber, a bulb or rootstock, as in the potato, the onion …   The Collaborative International Dictionary of English

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