aeolipile
C2Technical, Historical, Academic
Definition
Meaning
An ancient device, also known as Hero's engine, consisting of a rotating sphere mounted on a boiler, propelled by steam jets; considered an early demonstration of steam power.
A primitive steam turbine or a scientific demonstration model used historically to illustrate the principles of reactive forces and thermodynamics. In modern usage, it can refer to any similar educational apparatus demonstrating Newton's third law or steam power.
Linguistics
Semantic Notes
The term is highly specialized and almost exclusively used in historical or scientific contexts. It refers to a specific, named artifact from antiquity, not a general category of machine.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning or usage. Both variants recognise the same historical device.
Connotations
Conveys historical/classical scholarship and early engineering history.
Frequency
Extremely rare in both varieties, appearing only in specialized texts.
Vocabulary
Collocations
Grammar
Valency Patterns
The [inventor/scholar] constructed an aeolipile.The [museum/exhibit] features a replica aeolipile.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “(No common idioms for this word.)”
Usage
Context Usage
Business
Not used.
Academic
Used in history of science, classical studies, or thermodynamics lectures to describe an early steam device.
Everyday
Virtually never used.
Technical
Used in engineering history to denote the specific apparatus attributed to Hero of Alexandria.
Examples
By Part of Speech
verb
British English
- (Not used as a verb.)
American English
- (Not used as a verb.)
adverb
British English
- (Not used as an adverb.)
American English
- (Not used as an adverb.)
adjective
British English
- (Not used as an adjective.)
American English
- (Not used as an adjective.)
Examples
By CEFR Level
- (Word not suitable for A2 level.)
- (Word not suitable for B1 level.)
- The science museum had a working model of an aeolipile.
- The aeolipile, or Hero's engine, is often cited as the earliest known example of a reaction turbine, prefiguring much later steam technology.
Learning
Memory Aids
Mnemonic
Think: AEOLus (Greek god of wind) + PILE (as in a heap or structure). It's a 'wind-making structure' powered by steam.
Conceptual Metaphor
SEED OF TECHNOLOGY (a primitive, early form that contains the potential for future development).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'турбина' (modern turbine). The aeolipile is specifically an ancient, educational model, not an industrial machine. A more accurate, though descriptive, translation would be 'эолипил' (transliteration) or 'шар Герона' (Hero's sphere).
Common Mistakes
- Spelling: often misspelled as 'aeolipyle', 'eolipile'. Pronunciation: stressing the first syllable incorrectly (/ˈeɪ.əʊ.lɪ.paɪl/). Using it as a general term for any steam engine.
Practice
Quiz
An aeolipile is primarily associated with which of the following?
FAQ
Frequently Asked Questions
In British English: /iːˈɒlɪpʌɪl/ (ee-OL-i-pile). In American English: /iˈɑːləpaɪl/ (ee-AH-luh-pile).
It derives from the Latin 'aeolipila', from Aeolus (the Greek god of wind) and pila (ball). It essentially means 'ball of Aeolus'.
No, it was a demonstration device with very low efficiency, not a practical source of mechanical work. Its importance is historical and educational.
Almost exclusively in academic texts on the history of science, technology, or engineering, or in high-level science museum exhibits.