castor-oil plant: meaning, definition, pronunciation and examples
C1formal, technical, botanical
Quick answer
What does “castor-oil plant” mean?
A tall, fast-growing tropical shrub or small tree (Ricinus communis) with large, lobed leaves, cultivated for the seeds from which castor oil is extracted.
Audio
Pronunciation
Definition
Meaning and Definition
A tall, fast-growing tropical shrub or small tree (Ricinus communis) with large, lobed leaves, cultivated for the seeds from which castor oil is extracted.
The source of castor oil, a substance with a wide range of uses from industrial lubricant to traditional laxative. It is also considered a highly invasive and toxic plant in many regions.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning or usage. The spelling is consistent.
Connotations
In both varieties, it connotes botany, medicine (historically), and toxicity.
Frequency
Equally low frequency in both varieties, confined to specialized contexts.
Grammar
How to Use “castor-oil plant” in a Sentence
[The] castor-oil plant [verb] (e.g., grows, contains, produces).cultivate/harvest/identify [the] castor-oil plant.Vocabulary
Collocations
Usage
Meaning in Context
Business
Rare. Might appear in agricultural commodity reports or biotech/pharma contexts related to oil production.
Academic
Common in botany, toxicology, agriculture, and historical medical texts.
Everyday
Very rare. Typically only used by gardeners, foragers, or in regions where the plant is invasive.
Technical
Standard term in botany, horticulture, and toxicology.
Vocabulary
Synonyms of “castor-oil plant”
Strong
Neutral
Weak
Watch out
Common Mistakes When Using “castor-oil plant”
- Writing it as 'castor oilplant' (should be hyphenated).
- Confusing it with the oil product ('castor oil').
- Pronouncing 'castor' as /ˈkæstər/ in British English (it's /ˈkɑːstə/).
FAQ
Frequently Asked Questions
Yes. All parts of the plant, especially the seeds, contain ricin, a deadly poison. The oil is safe because the toxin is not oil-soluble and is removed during processing.
It is possible in warm climates, but it is often discouraged. It is fast-growing and can become invasive. More importantly, it poses a significant poisoning risk to children and pets.
Historically as a laxative, but modern uses are predominantly industrial (lubricants, biofuels, plastics). It is also used in cosmetics and some traditional medicines.
Ricin, the toxin found in the plant's seeds, has been investigated and used as a chemical weapon due to its high toxicity and ease of extraction.
A tall, fast-growing tropical shrub or small tree (Ricinus communis) with large, lobed leaves, cultivated for the seeds from which castor oil is extracted.
Castor-oil plant is usually formal, technical, botanical in register.
Castor-oil plant: in British English it is pronounced /ˌkɑːstər ˈɔɪl ˌplɑːnt/, and in American English it is pronounced /ˌkæstər ˈɔɪl ˌplænt/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think of a CAST (like in a play) pouring OIL on a PLANT. The actor (cast) oils the plant to make it grow fast and produce beans for medicine.
Conceptual Metaphor
A PLANT IS A FACTORY (it produces oil). A PLANT IS A DANGER (it contains poison).
Practice
Quiz
What is the primary reason for the widespread cultivation of the castor-oil plant?