castor bean: meaning, definition, pronunciation and examples
C1Technical / Scientific / Agricultural
Quick answer
What does “castor bean” mean?
The seed of the castor oil plant (Ricinus communis).
Audio
Pronunciation
Definition
Meaning and Definition
The seed of the castor oil plant (Ricinus communis).
The seed, which is the source of castor oil and contains the highly toxic substance ricin.
Dialectal Variation
British vs American Usage
Differences
Both varieties use 'castor bean' (US) and 'castor seed' (UK) interchangeably, though 'castor seed' is slightly more common in formal UK agricultural contexts.
Connotations
Identical technical and toxic connotations in both varieties.
Frequency
Low frequency in general discourse, but standard in relevant technical fields in both regions.
Grammar
How to Use “castor bean” in a Sentence
The castor bean contains ricin.Oil is extracted from the castor bean.They cultivated castor beans.Vocabulary
Collocations
Examples
Examples of “castor bean” in a Sentence
adjective
British English
- castor-bean cultivation
- castor-bean toxicity
American English
- castor-bean processing
- castor-bean extract
Usage
Meaning in Context
Business
Rare, except in specific industries related to oils, biofuels, or agrochemicals.
Academic
Common in botany, toxicology, agriculture, and biochemistry papers.
Everyday
Very rare; used only when discussing plant toxicity or homemade remedies.
Technical
Standard term in agricultural, chemical, and security/forensic contexts.
Vocabulary
Synonyms of “castor bean”
Neutral
Weak
Watch out
Common Mistakes When Using “castor bean”
- Using 'castor bean' to refer to the whole plant (correct: 'castor oil plant').
- Misspelling as 'caster bean'.
- Assuming it is a type of edible bean.
FAQ
Frequently Asked Questions
No, it is not a legume. 'Bean' is a common name for its bean-like appearance. It is botanically a seed.
No, they are highly toxic if not properly processed to remove ricin. Ingesting even one chewed seed can be fatal.
Castor oil, pressed from the seeds, is used in lubricants, biofuels, plastics, and traditionally as a laxative or in cosmetics.
It is a hardy, fast-growing crop cultivated primarily for industrial castor oil, which is valuable and non-toxic after processing.
The seed of the castor oil plant (Ricinus communis).
Castor bean is usually technical / scientific / agricultural in register.
Castor bean: in British English it is pronounced /ˈkɑːstə biːn/, and in American English it is pronounced /ˈkæstər biːn/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think of the CAST in 'castor' as in 'casting a spell' – a bean that can be dangerously magical (toxic) if misused.
Conceptual Metaphor
A SMALL PACKAGE OF CONTRADICTION (source of healing oil and deadly poison).
Practice
Quiz
What is a 'castor bean' primarily known for?