a. the organ of a higher plant that anchors the rest of the plant in the ground, absorbs water and mineral salts from the soil, and does not bear leaves or buds
b. (loosely) any of the branches of such an organ
2. (Life Sciences & Allied Applications / Botany) any plant part, such as a rhizome or tuber, that is similar to a root in structure, function, or appearance
a. the essential, fundamental, or primary part or nature of something your analysis strikes at the root of the problem
b. (as modifier) the root cause of the problem
4. (Life Sciences & Allied Applications / Anatomy) Anatomy the embedded portion of a tooth, nail, hair, etc.
5. origin or derivation, esp as a source of growth, vitality, or existence
6.(plural) a persons sense of belonging in a community, place, etc., esp the one in which he was born or brought up
7. an ancestor or antecedent
8. (Christian Religious Writings / Bible) Bible a descendant
9. (Linguistics) the form of a word that remains after removal of all affixes; a morpheme with lexical meaning that is not further subdivisible into other morphemes with lexical meaning Compare stem1 
10. (Mathematics) Maths a number or quantity that when multiplied by itself a certain number of times equals a given number or quantity 3 is a cube root of 27
11. (Mathematics) Also called solutionMaths a number that when substituted for the variable satisfies a given equation 2 is a root of x3 - 2x - 4 = 0
12. (Music, other) Music (in harmony) the note forming the foundation of a chord
13.Austral and NZslang sexual intercourse
root and branch
a.(adverb) entirely; completely; utterly
b.(adjective) thorough; radical; complete Related adjective radical
1. (Life Sciences & Allied Applications / Botany) (intr) Also take root to put forth or establish a root and begin to grow
2.(intr) Also take root to become established, embedded, or effective
3.(tr) to fix or embed with or as if with a root or roots
[Old English rōt, from Old Norse; related to Old English wyrtwort]
1. (Life Sciences & Allied Applications / Zoology) (of a pig) to burrow in or dig up the earth in search of food, using the snout
2.(foll by about, around, in etc.)Informal to search vigorously but unsystematically
[changed (through influence of root1) from earlier wroot, from Old English wrōtan; related to Old English wrōt snout, Middle Dutch wrōte mole]
(General Sporting Terms) (intr; usually foll by for)Informal to give support to (a contestant, team, etc.), as by cheering
[perhaps a variant of Scottish rout to make a loud noise, from Old Norse rauta to roar]
1. A plant part that usually grows underground, secures the plant in place, absorbs minerals and water, and stores food manufactured by leaves and other plant parts. Roots grow in a root system. Eudicots and magnoliids have a central, longer, and larger taproot with many narrower lateral roots branching off, while monocots have a mass of threadlike fibrous roots, which are roughly the same length and remain close to the surface of the soil. In vascular plants, roots usually consist of a central cylinder of vascular tissue, surrounded by the pericycle and endodermis, then a thick layer of cortex, and finally an outer epidermis or (in woody plants) periderm. Only finer roots (known as feeder roots) actively take up water and minerals, generally in the uppermost meter of soil. These roots absorb minerals primarily through small epidermal structures known as root hairs. In certain plants, adventitious roots grow out from the stem above ground as aerial roots or prop roots, bending down into the soil, to facilitate the exchange of gases or increase support. Certain plants (such as the carrot and beet) have fleshy storage roots with abundant parenchyma in their vascular tissues. See also fibrous roottaproot
2. Any of various other plant parts that grow underground, especially an underground stem such as a corm, rhizome, or tuber.
3. The part of a tooth that is embedded in the jaw and not covered by enamel.
a. A number that, when multiplied by itself a given number of times, produces a specified number. For example, since 2 ? 2 ? 2 ? 2 = 16, 2 is a fourth root of 16.
b. A solution to an equation. For example, a root of the equation x2 - 4 = 0 is 2, since 22 - 4 = 0.
root /rut/ n.1 the part of a plant that grows downward into the soil and brings food and water into the plant: The roots of trees grow deep into the earth.2 the bottom part of s.t., such as a root that holds that thing in place: He pulled a piece of his sisters hair out by the roots.3 the most important part or cause of s.t.: Wanting to have more money is the root of all evil.4to have roots: important connections, such as having a family, job, and friends in a place: He has roots in that town and does not want to leave it.5 (in grammar) a word or part of a word that can be used to make other words: Spect is the root of words like spectacle and inspection.6square root: (in mathematics) the number that, when multiplied by itself, equals a given number: The square root of 9 is 3. v.1 [I;T] to grow into the ground: The tree rooted into good soil.2 [I] to dig with ones nose: Pigs root in the ground.3 phrasal v. [I] to root around: to look for s.t. under other things or under the ground: I rooted around in my big closet and found my old football.4 phrasal v.insep. [I] to root for: to follow a player or team and want them to win: We root for the local high school baseball team.5 phrasal v.sep. [T] to root s.o. or s.t. out: to completely eliminate s.o. or s.t. (usu. bad): We rooted out the corruption.||We rooted it out.6to take root: a. to grow strong roots: Plants take root in the spring.b.fig. to establish themselves (ideas, movements): Democracy takes root in many countries.-adj.rootless.
Thesaurus: root n. 2 a base | foundation3 the basis of s.t., source, origin.