Usually means: Line extending infinitely in one direction.
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We found 57 dictionaries that define the word ray:

General (29 matching dictionaries)
  1. Ray, ray: Merriam-Webster.com
  2. ray, ray, ray: Oxford Learner's Dictionaries
  3. ray, ray: American Heritage Dictionary of the English Language
  4. ray: Collins English Dictionary
  5. ray: Vocabulary.com
  6. Ray, ray: Wordnik
  7. ray: Cambridge Advanced Learner's Dictionary
  8. Ray: InfoVisual Visual Dictionary
  9. Ray, ra'y, ray: Wiktionary
  10. ray: Webster's New World College Dictionary, 4th Ed.
  11. ray: The Wordsmyth English Dictionary-Thesaurus
  12. ray: Infoplease Dictionary
  13. ray: Dictionary.com
  14. ray (1), ray (2): Online Etymology Dictionary
  15. ray: Cambridge Essential American English Dictionary
  16. Ra'y, Ray (DC Comics), Ray (Frazier Chorus album), Ray (L'Arc-en-Ciel album), Ray (Ray Terrill), Ray (Trailer Park Boys character), Ray (city), Ray (comics), Ray (disambiguation), Ray (film), Ray (fish), Ray (flying squirrel), Ray (geometry), Ray (given name), Ray (manga), Ray (mathematics), Ray (movie), Ray (musician), Ray (optics), Ray (quantum theory), Ray (soundtrack), Ray (surname), Ray (wrestler), Ray, The Ray (Chardin), The Ray (comics), The Ray (painting), The Ray: Wikipedia, the Free Encyclopedia
  17. Ray: Online Plain Text English Dictionary
  18. ray: Webster's Revised Unabridged, 1913 Edition
  19. ray: Rhymezone
  20. ray: AllWords.com Multi-Lingual Dictionary
  21. ray: Webster's 1828 Dictionary
  22. ray: Free Dictionary
  23. ray: Mnemonic Dictionary
  24. Ray, ray: LookWAYup Translating Dictionary/Thesaurus
  25. Ray: Dictionary/thesaurus
  26. ray: Wikimedia Commons US English Pronunciations
  27. ray(e): AllWords.com Multi-Lingual Dictionary

Art (1 matching dictionary)
  1. ray: ArtLex Lexicon of Visual Art Terminology

Business (2 matching dictionaries)
  1. ray: Legal dictionary
  2. ray: Financial dictionary

Computing (1 matching dictionary)
  1. Ray (fish), Ray (optics), Ray (zoology), ray: Encyclopedia

Medicine (3 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. online medical dictionary (No longer online)
  3. ray: Medical dictionary

Miscellaneous (6 matching dictionaries)
  1. baby names list (No longer online)
  2. Encyclopedia of the Orient (No longer online)
  3. RAY: Acronym Finder
  4. RAY: Three Letter Words with definitions
  5. AbbreviationZ (No longer online)
  6. ray: Idioms

Science (7 matching dictionaries)
  1. A Glossary of Mathematical Terms (No longer online)
  2. Ray: Eric Weisstein's World of Mathematics
  3. Botanical Terms (No longer online)
  4. Mathematical Programming (No longer online)
  5. ray: Mussel Glossary
  6. -Ray: Extragalactic Astronomy
  7. ray, ray, ray: PlanetMath Encyclopedia

Slang (2 matching dictionaries)
  1. ray: Green’s Dictionary of Slang
  2. RAY: Urban Dictionary

Tech (6 matching dictionaries)
  1. ray: Webster's New World Telecom Dictionary
  2. AUTOMOTIVE TERMS (No longer online)
  3. Glossary of Meteorology (No longer online)
  4. Glossary of Woodworking Terms (No longer online)
  5. Schlumberger Oilfield Glossary (No longer online)
  6. Urban Conservation Glossary (No longer online)

(Note: See rayed as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  A beam of light or radiation.
noun:  (zoology) A rib-like reinforcement of bone or cartilage in a fish's fin.
noun:  (zoology) One of the spheromeres of a radiate, especially one of the arms of a starfish or an ophiuran.
noun:  (botany) A radiating part of a flower or plant; the marginal florets of a compound flower, such as an aster or a sunflower; one of the pedicels of an umbel or other circular flower cluster; radius.
noun:  (obsolete) Sight; perception; vision; from an old theory of vision, that sight was something which proceeded from the eye to the object seen.
noun:  (mathematics) A line extending indefinitely in one direction from a point.
noun:  (colloquial) A tiny amount.
verb:  (transitive) To emit something as if in rays.
verb:  (intransitive) To radiate as if in rays.
verb:  (transitive) To expose to radiation.
noun:  A marine fish with a flat body, large wing-like fins, and a whip-like tail.
verb:  (obsolete) To arrange.
verb:  (now rare) To dress, array (someone).
verb:  (obsolete) To stain or soil; to defile.
noun:  (obsolete) Array; order; arrangement; dress.
noun:  The letter ⟨/⟩, one of two which represent the r sound in Pitman shorthand.
noun:  A surname transferred from the nickname.
noun:  A diminutive of the male given name Raymond, also used as a formal given name.
noun:  A diminutive of the female given name Rachel, more often spelled Rae.
noun:  A number of places in the United States:
noun:  A census-designated place in Coosa County, Alabama.
noun:  A ghost town in Pinal County, Arizona.
noun:  An unincorporated community in Fremont Township, Steuben County, Indiana and Branch County, Michigan.
noun:  A township in Macomb County, Michigan.
noun:  An unincorporated community in Koochiching County, Minnesota.
noun:  A minor city in Williams County, North Dakota.
noun:  A river in Buckinghamshire and Oxfordshire, England, which joins the River Cherwell.
noun:  A river in north Wiltshire, England, which joins the Thames.
noun:  A city near Tehran, Iran.
noun:  (historical) a region and satrapy in ancient Iran located between the Alborz and Zagros mountain ranges and the Dasht-e Kavir desert; Rhagiana
noun:  (music) Alternative form of re [(music) A syllable used in solfège to represent the second note of a major scale.]

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