clepsydra

clep·sy·dra  (klps-dr)

n. pl. clep·sy·dras or clep·sy·drae (-dr)

An ancient device that measured time by marking the regulated flow of water through a small opening. Also called water glass.

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[Latin, from Greek klepsudra : kleptein, kleps-, to steal + hudr, water; see wed-¹ in Indo-European roots.]

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clepsydra [ˈklɛpsɪdrə]

n pl -dras, -drae [-ˌdriː]

(Miscellaneous Technologies / Horology) an ancient device for measuring time by the flow of water or mercury through a small aperture Also called water clock

[from Latin, from Greek klepsudra, from kleptein to steal + hudōr water]

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clepsydra

an instrument for measuring time by the controlled flow of water or mercury through a small opening.

See also: Instruments, Time

Thesaurus

Noun

1.

clepsydra - clock that measures time by the escape of water water clock, water glass clock - a timepiece that shows the time of day