clepsydra means synonym of water clock, especially (historical) ancient Greek and Roman forms. Lexicurio rates it Sui generis — a strength score of 85 out of 100.
clepsydra is pronounced /ˈklɛpsɪdɹə/.
Why “clepsydra” is a great word
CLEPSYDRA — [Noun] An ancient water clock that measures time by the regulated flow of water from one vessel into another. From Latin clepsydra, from Ancient Greek κλεψύδρα (klepsúdra), from κλέπτειν (kléptein, “to steal”) + ὕδωρ (húdōr, “water”), literally 'water-thief'; first attested in English in the 1640s. Unlike an hourglass, which marks moments with a granular hiss, or a sundial, which depends on the sun's fickle patronage, the clepsydra measures with a liquid constancy, an internal and calibrated leak. It is the patient metallic plink in a quiet chamber, the imperceptible descent of a waterline against graduated marks, and the cool, perpetual bead forming at the lip of a bronze spout—time itself, a current slipping irrevocably away.
Etymology
From Latin clepsydra, from Ancient Greek κλεψύδρα (klepsúdra), from κλέπτειν (kléptein, “to steal”) + ὕδωρ (húdōr, “water”).
noun
- Synonym of water clock, especially (historical) ancient Greek and Roman forms.“"The dull, unflavoured drops from life's clepsydra".”