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# castor

«castor» in Mova's school dictionary: **A small wheel fixed under a chair, bed, trolley or piece…** — its meaning for a pupil, its sense in the lessons and examples.

### part of speech

noun (a castor, castors; castor — uncountable in "castor oil"); name (Castor)

### meaning for a pupil

1) A small wheel fixed under a chair, bed, trolley or piece of furniture so it can be moved easily (also spelled "caster"). [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/C/castor/#m1)

2) In "castor oil": a thick, bad-tasting oil from the seeds of the castor oil plant, once given to children as a medicine. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/C/castor/#m2)

3) In "castor sugar" (UK, also "caster sugar"): very fine white sugar used in baking. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/C/castor/#m3)

4) (a name) Castor is a bright star in the Gemini constellation, named after one of the twins in Greek myths. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/C/castor/#m4)

5) Castor can also be the name of a twin hero from Greek myths, who was a famous horseman. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/C/castor/#m5)

### sense in the lessons

In everyday life office chairs and hospital beds roll on castors. In history and old stories castor oil was a nasty medicine children dreaded. In baking lessons caster or castor sugar dissolves quickly in cakes and meringues. In astronomy, Castor and Pollux are the twin stars of Gemini.

### examples

- The office chair rolls on five castors. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/C/castor/#x1)
- One castor broke, so the trolley wobbles. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/C/castor/#x2)
- In old books, children were given a spoon of castor oil. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/C/castor/#x3)
- Use castor sugar to make meringues. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/C/castor/#x4)
- Castor and Pollux are the brightest stars in Gemini. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/C/castor/#x5)
- Castor oil comes from the seeds of the castor bean plant. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/C/castor/#x6)
- They were also famous for their physical accomplishments, Castor being the most expert charioteer of his day, and Pollux the first of pugilists. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/C/castor/#x7)

### note

Spelling: both castor and caster are used for the wheel and the sugar. Safety: the seeds of the castor oil plant are very poisonous to eat, though the oil itself is processed safely. The star Castor has a capital C.

### Trees and pragmatics

[Every meaning and example of «castor» parsed by Mova](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/C/castor/), each sentence with its dependency tree and frames.