What does "castor" mean?
A hat made from the fur of the beaver.
Castor
/ˈkɑːs.tə/ name, noun
name, noun ·Uncommon ·College level
Meaning at a glance
- Primary sense: A hat made from the fur of the beaver.
- Grammar: castor is listed as name, noun.
- Nearest alternatives: beaver, beavers, cap, caster.
- Usage evidence: Castor and Pollux were twin brothers.
How to use "castor"
- Start with the primary definition, then check the part of speech before placing the word in a sentence.
- Compare nearby synonyms to make sure "castor" carries the exact meaning, tone, and strength you need.
- Use the example sentence as a context check. If your sentence uses the word differently, confirm that the grammar still fits.
Meaning check
- Does the word fit the sentence's grammar?
- Does it match the intended tone rather than only the dictionary definition?
- Would a simpler synonym be clearer for the reader?
- Is there enough surrounding context to prevent ambiguity?
Source and review context
This entry combines structured lexical data with WordToolSet review checks. Definitions, examples, synonyms, and usage notes may come from different source tables, so the page is designed to show evidence from more than one angle before you rely on "castor" in a final draft.
If a word has several senses, prefer the sense that matches your sentence's grammar and surrounding context. A correct definition can still be the wrong choice when the sentence needs a different register, emphasis, or level of specificity.
Before you rely on this definition
Read the first definition as a starting point, then check the example, synonyms, and part of speech before treating "castor" as the right word for your sentence.
If your draft is formal, technical, persuasive, or sensitive, compare "castor" with a nearby alternative so the final choice matches both meaning and reader expectation.
Compare nearby meanings
- Use synonyms when you need a softer, stronger, simpler, or more specific word.
- Use antonyms to check the boundary of the meaning and avoid accidental contrast.
- Use the example sentence to confirm the word behaves naturally in context.
- Keep the original wording when a replacement adds complexity without improving precision.
Definition decision workflow
1. Identify the role
Check whether "castor" is acting as name, noun in your sentence. A definition is only useful when the grammar matches the way the word is being used.
2. Test the nearest option
Compare it with "beaver" and other nearby choices to see whether the sentence needs a softer, stronger, or more familiar word.
3. Confirm with context
Use the example sentence below as an evidence check, then read your own sentence out loud to catch tone or rhythm problems.
Review note: Definition pages are checked for source coverage, sentence evidence, synonym support, and editorial insight before they are treated as approval-ready pages. If the evidence is too thin, the page remains available to users but is kept out of the approval-facing indexed inventory.
Final meaning check
Before publishing a sentence with "castor", ask whether the word helps the reader understand the idea faster. A precise word should reduce confusion, not simply make the sentence look more polished.
When the definition, synonym evidence, and example context point in the same direction, the word is usually a safer choice. When they conflict, revise the sentence or choose a clearer alternative.
Definitions
Noun
- 1 A hat made from the fur of the beaver. countable, uncountable
"I have been always noted for the jaunty manner in which I wear my castor—[…]"
- 2 A variety of petalite found in Elba. uncountable
- 3 Alternative spelling of caster, especially in its senses; A pivoting roller attached to the bottom of furniture to allow it to be moved. UK, especially
- 4 a hat made with the fur of a beaver (or similar material) wordnet
- 5 A heavy quality of broadcloth for overcoats. countable, uncountable
Show 5 more definitions
- 6 Alternative spelling of caster, especially in its senses; A container with a perforated cap for sprinkling its contents, especially salt, pepper, etc. UK, especially
"Mrs. Hussey soon appeared, with a mustard-pot in one hand and a vinegar-cruet in the other, having just broken away from the occupation of attending to the castors, and scolding her little black boy meantime."
- 7 a pivoting roller attached to the bottom of furniture or trucks or portable machines to make them movable wordnet
- 8 Castoreum (bitter exudate of mature beavers). countable, uncountable
- 9 a shaker with a perforated top for sprinkling powdered sugar wordnet
- 10 Any of various nymphalid butterflies of the genus Ariadne, of Africa and Asia. countable, uncountable
Proper Noun
- 1 One of the Dioscuri Greek
- 2 A double star in the constellation Gemini; alpha (α) Geminorum.
- 3 A village and civil parish in city of Peterborough district, Cambridgeshire, England (OS grid ref TL1298).
- 4 A town in the County of Paintearth, Alberta, Canada. From French castor (“beaver”).
- 5 A village in Bienville Parish, Louisiana, United States. From French castor (“beaver”).
Show 1 more definition
- 6 A surname.
Synonyms
All synonymsExample
"Castor and Pollux were twin brothers."
Common questions
What is a synonym for "castor"?
Common synonyms include: beaver, beavers, cap, caster, castor fiber, castor oil.
How do you use "castor" in a sentence?
Castor and Pollux were twin brothers.
How do you pronounce "castor"?
Pronounced /ˈkɑːs.tə/.
Etymology
Etymology 1
From Middle French castor, from Old French castor (“beaver”), from Latin castor (“beaver”), from Ancient Greek κάστωρ (kástōr), from Doric Greek κάστον (káston, “wood”).
Etymology 2
Named from Greek mythology; see Castor and Pollux. The name pollux was given to another mineral with which it was always found.
Etymology 3
Alternative spelling of caster, via cast + -or (the Latinate varient of -er).
Etymology 4
From Ancient Greek Κάστωρ (Kástōr), from Ancient Greek κάστωρ (kástōr, “beaver”).