English plural of clepsydra; multiple water-clock devices.
Anglicized plural of clepsydra, using the standard English -s suffix instead of the Latin -ae ending, showing how technical terms gradually become part of English.
You can say either 'clepsydras' or 'clepsydrae' and sound right—it shows how English constantly absorbs foreign words and can't quite decide whether to keep them foreign or make them English.
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