Usually means: Wheel or caster for mobility.
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We found 34 dictionaries that define the word castor:

General (26 matching dictionaries)
  1. Castor, castor: Merriam-Webster.com
  2. Castor, Castor, castor: Oxford Learner's Dictionaries
  3. Castor, castor, castor: American Heritage Dictionary of the English Language
  4. castor: Collins English Dictionary
  5. Castor, castor: Vocabulary.com
  6. Castor, castor: Wordnik
  7. castor: Cambridge Advanced Learner's Dictionary
  8. castor: Wiktionary
  9. castor: Webster's New World College Dictionary, 4th Ed.
  10. Castor, castor: The Wordsmyth English Dictionary-Thesaurus
  11. castor: Infoplease Dictionary
  12. Castor: Dictionary.com
  13. castor: Online Etymology Dictionary
  14. Castor (band), Castor (disambiguation), Castor (framework), Castor (genus), Castor (mountain), Castor (mythology), Castor (rocket stage), Castor (star), Castor: Wikipedia, the Free Encyclopedia
  15. Castor: Online Plain Text English Dictionary
  16. castor: Webster's Revised Unabridged, 1913 Edition
  17. Castor: Rhymezone
  18. Castor, castor, castor (m): AllWords.com Multi-Lingual Dictionary
  19. castor: Webster's 1828 Dictionary
  20. CASTOR: Stammtisch Beau Fleuve Acronyms
  21. Castor: Dictionary of Phrase and Fable (1898)
  22. castor: Free Dictionary
  23. castor: Mnemonic Dictionary
  24. Castor: Dictionary/thesaurus

Art (1 matching dictionary)
  1. Epicurus.com Wine Glossary (No longer online)

Computing (1 matching dictionary)
  1. Castor (genus), Castor (mythology), Castor (zoology), Castor: Encyclopedia

Medicine (1 matching dictionary)
  1. Castor (genus), Castor (zoology), castor: Medical dictionary

Miscellaneous (1 matching dictionary)
  1. CASTOR: Acronym Finder

Science (1 matching dictionary)
  1. Castor: Extragalactic Astronomy

Slang (2 matching dictionaries)
  1. castor, castor: Green’s Dictionary of Slang
  2. castor: Urban Dictionary

Tech (1 matching dictionary)
  1. AUTOMOTIVE TERMS (No longer online)

(Note: See castors as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  A hat made from the fur of the beaver.
noun:  A heavy quality of broadcloth for overcoats.
noun:  Castoreum (bitter exudate of mature beavers).
noun:  Any of various nymphalid butterflies of the genus Ariadne, of Africa and Asia.
noun:  (mineralogy) A variety of petalite found in Elba.
noun:  (especially UK) Alternative spelling of caster, especially in its senses
noun:  A pivoting roller attached to the bottom of furniture to allow it to be moved.
noun:  A container with a perforated cap for sprinkling its contents, especially salt, pepper, etc.
noun:  (Greek mythology) One of the Dioscuri
noun:  (astronomy) A double star in the constellation Gemini; alpha (α) Geminorum.
noun:  A village and civil parish in city of Peterborough district, Cambridgeshire, England (OS grid ref TL1298).
noun:  A town in Alberta, Canada. From French castor (“beaver”).
noun:  A village in Bienville Parish, Louisiana, United States. From French castor (“beaver”).
noun:  A surname.

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