Usually means: Origin, base of word, plant.
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We found 70 dictionaries that define the word root:

General (29 matching dictionaries)
  1. root: Longman Dictionary of Contemporary English
  2. Root, root: Merriam-Webster
  3. root, root: Oxford Learner's Dictionaries
  4. root, root, root: American Heritage Dictionary of the English Language
  5. root: Collins English Dictionary
  6. root: Vocabulary.com
  7. Root, root: Wordnik
  8. root: Cambridge Advanced Learner's Dictionary
  9. Root, Root, Root, Root: InfoVisual Visual Dictionary
  10. Root, root: Wiktionary
  11. root: Webster's New World College Dictionary, 4th Ed.
  12. root: The Wordsmyth English Dictionary-Thesaurus
  13. root: Infoplease Dictionary
  14. root: Dictionary.com
  15. root (n.), root (v1.), root (v2.): Online Etymology Dictionary
  16. root: Cambridge Essential American English Dictionary
  17. ROOT, Root (Android), Root (album), Root (band), Root (chord), Root (company), Root (disambiguation), Root (linguistics), Root (math), Root (music), Root (plant), Root (surname), Root, Root, The Root (magazine), The Root: Wikipedia, the Free Encyclopedia
  18. Root: Online Plain Text English Dictionary
  19. root: Webster's Revised Unabridged, 1913 Edition
  20. root: Rhymezone
  21. root: AllWords.com Multi-Lingual Dictionary
  22. root: Webster's 1828 Dictionary
  23. root: FreeDictionary.org
  24. root: Mnemonic Dictionary
  25. Root: The Word Detective
  26. Root: TheFreeDictionary.com
  27. root: Wikimedia Commons US English Pronunciations

Art (3 matching dictionaries)
  1. Virginia Tech Multimedia Music Dictionary (No longer online)
  2. Linguistic Glossary (No longer online)
  3. Root: Lexicon of Linguistics

Business (5 matching dictionaries)
  1. root: Merriam-Webster Legal Dictionary
  2. Glossary of Legal Terms (No longer online)
  3. Root: Glossary of Health Care Terms
  4. Bouvier's Law Dictionary 1856 Edition (No longer online)
  5. Root (botany), Root (mathematics), root: Legal dictionary

Computing (7 matching dictionaries)
  1. root: Webster's New World Hacker Dictionary
  2. root: Free On-line Dictionary of Computing
  3. root: Dictionary of Algorithms and Data Structures
  4. Root: Tech Terms Computer Dictionary
  5. root: Hacking Lexicon
  6. I T Glossary (No longer online)
  7. Root (Unix), Root (botany), /root, root: Encyclopedia

Medicine (5 matching dictionaries)
  1. root: Merriam-Webster Medical Dictionary
  2. Dorland's Illustrated Medical Dictionary (No longer online)
  3. Orthodontic Terms (No longer online)
  4. online medical dictionary (No longer online)
  5. Root (botany), Root (disambiguation), root: Medical dictionary

Miscellaneous (5 matching dictionaries)
  1. Sound-Alike Words (No longer online)
  2. ROOT: Acronym Finder
  3. AbbreviationZ (No longer online)
  4. root: Idioms
  5. root: Wordcraft Dictionary

Religion (1 matching dictionary)
  1. Postmodern Bible Dictionary (No longer online)

Science (6 matching dictionaries)
  1. Root: Eric Weisstein's World of Mathematics
  2. Botanical Terms (No longer online)
  3. Tree of Life Glossary (No longer online)
  4. Flora of New South Wales (No longer online)
  5. root, root, root, root, root, root, root, root (of a tree): PlanetMath Encyclopedia
  6. root: Natural History Terms

Slang (5 matching dictionaries)
  1. root, root, root, root: Green’s Dictionary of Slang
  2. root: English slang and colloquialisms used in the United Kingdom
  3. Root: Street Terms: Drugs and the Drug Trade
  4. Root: Dublin Slang and Phrasebook
  5. Root, root: Urban Dictionary

Tech (4 matching dictionaries)
  1. root: Webster's New World Telecom Dictionary
  2. AUTOMOTIVE TERMS (No longer online)
  3. Glossary of Fastener Terms (No longer online)
  4. Sweetwater Music (No longer online)

(Note: See rooted as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  The part of a plant, generally underground, that anchors and supports the plant body, absorbs and stores water and nutrients, and in some plants is able to perform vegetative reproduction.
noun:  A root vegetable.
noun:  The part of a tooth extending into the bone holding the tooth in place.
noun:  The part of a hair under the skin that holds the hair in place.
noun:  The part of a hair near the skin that has not been dyed, permed, or otherwise treated.
noun:  (figurative) The primary source; origin.
noun:  (aviation) The section of a wing immediately adjacent to the fuselage.
noun:  (engineering) The bottom of the thread of a threaded object.
noun:  (arithmetic) Of a number or expression, a number which, when raised to a specified power, yields the specified number or expression.
noun:  (arithmetic) A square root (understood if no power is specified; in which case, "the root of" is often abbreviated to "root").
noun:  (mathematical analysis) A zero (of an equation).
noun:  (graph theory, computing) The single node of a tree that has no parent.
noun:  (linguistic morphology) The primary lexical unit of a word, which carries the most significant aspects of semantic content and cannot be reduced into smaller constituents. Inflectional stems often derive from roots.
noun:  (linguistics) A word from which another word or words are derived.
noun:  (music) The fundamental tone of any chord; the tone from whose harmonics, or overtones, a chord is composed.
noun:  The lowest place, position, or part.
noun:  (computing) In UNIX terminology, the first user account with complete access to the operating system and its configuration, found at the root of the directory structure; the person who manages accounts on a UNIX system.
noun:  (computing) The highest directory of a directory structure which may contain both files and subdirectories.
noun:  (slang) A penis, especially the base of a penis.
verb:  To grow roots; to enter the earth, as roots; to take root and begin to grow.
verb:  To prepare, oversee, or otherwise cause the rooting of cuttings.
verb:  To fix firmly; to establish.
verb:  (computing slang, transitive) To get root or privileged access on (a computer system or mobile phone), often through bypassing some security mechanism.
verb:  (ambitransitive) To turn up or dig with the snout.
verb:  (by extension) To seek favour or advancement by low arts or grovelling servility; to fawn.
verb:  (intransitive) To rummage; to search as if by digging in soil.
verb:  (intransitive) Of a baby: to turn the head and open the mouth in search of food.
verb:  (transitive) To root out; to abolish.
verb:  (equestrianism, of a horse) To tug or pull at the reins aggressively by driving the head downwards while wearing a bit.
verb:  (Australia, New Zealand, Ireland, vulgar, slang) To sexually penetrate.
noun:  (Australia, New Zealand, vulgar, slang) An act of sexual intercourse.
noun:  (Australia, New Zealand, vulgar, slang) A sexual partner.
verb:  (intransitive, with "for" or "on", US) To cheer (on); to show support (for) and hope for the success of. (See root for.)
noun:  An English surname from Middle English from a byname from Middle English rote (“glad”).
noun:  An English surname originating as an occupation for a rote (medieval guitar)-player.
noun:  A habitational surname from Dutch for someone living near a retting place (Dutch root, from roten (“to ret”)).
noun:  A town in Lucerne canton, Switzerland.
noun:  A township in Adams County, Indiana, United States.
noun:  A town in Montgomery County, New York, United States; named for lawyer and politician Erastus Root.
noun:  A river in Minnesota, United States; named as a translation of its native Dakota name.
noun:  A river in Wisconsin, United States.

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