clepsydra
C2+Formal, Literary, Historical, Technical
Definition
Meaning
An ancient timekeeping device that measures time by the regulated flow of water from or into a container.
Any device that uses the flow of a liquid to measure intervals of time. Also used metaphorically for something that measures the passage of time or a finite, diminishing resource.
Linguistics
Semantic Notes
The term is highly specific and almost exclusively refers to ancient devices. It is rarely used in a literal, modern context but may appear in historical or poetic writing. It is a 'fossil word' from a specialized domain.
Dialectal Variation
British vs American Usage
Differences
No significant differences in usage or meaning. The word is equally rare in both varieties.
Connotations
Connotes antiquity, precision (for its time), and classical scholarship.
Frequency
Extremely low frequency in both varieties, encountered almost exclusively in academic historical texts or as a deliberate literary flourish.
Vocabulary
Collocations
Grammar
Valency Patterns
[Noun] The clepsydra was used in [place/time period][Noun] The clepsydra measured [time interval]Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “Like a human clepsydra (poetic, rare): referring to someone who measures out their life in a steady, predictable, or diminishing way.”
Usage
Context Usage
Business
Virtually never used.
Academic
Used in history, archaeology, classics, and history of science papers to describe ancient timekeeping technology.
Everyday
Not used.
Technical
Used in specific discussions of horology (clock-making history) or museum cataloguing.
Examples
By Part of Speech
adjective
British English
- The clepsydra mechanism was ingeniously simple.
American English
- The clepsydra design was ingeniously simple.
Examples
By CEFR Level
- The museum had a model of an old water clock.
- Before mechanical clocks, civilisations like the Greeks used a clepsydra to time legal speeches.
- The philosopher metaphorically described his dwindling days as sand in an hourglass, though a clepsydra would have been the more technologically appropriate analogy for his era.
Learning
Memory Aids
Mnemonic
Think: 'CLEP' sounds like 'clip' (a short segment) and 'SYDRA' sounds like 'hydro' (water). A clepsydra 'clips' time using water.
Conceptual Metaphor
TIME IS A FLUID RESOURCE (that can be contained, measured, and can run out).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid confusing with 'песочные часы' (hourglass/sandglass). The correct Russian equivalent is 'клепсидра' or 'водяные часы'.
Common Mistakes
- Misspelling: clepsydia, clepsidra, clepsydria. Mispronunciation: /klɛpˈsaɪdrə/ (emphasis on second syllable). Using it to refer to an hourglass.
Practice
Quiz
What is a clepsydra?
FAQ
Frequently Asked Questions
No. An hourglass uses sand, while a clepsydra uses the flow of water. They are both ancient timekeepers but operate on different principles.
You would primarily encounter it in advanced historical or academic texts, or in very deliberate poetic or literary language. It is not a word for everyday conversation.
It comes from the Greek 'klepsydra', from 'kleptein' (to steal) + 'hydōr' (water) — literally 'water thief', referring to the water flowing or 'being stolen' from the vessel.
Not for practical timekeeping. They are historical artefacts, reproductions in museums, or sometimes built as educational projects or artistic installations.