Definition of "Horologium"

(historical) Synonym of Tower of the Winds, a monument in ancient Athens that included a clepsydra and multiple prominent sundials.

(historical) Synonym of Solarium, a monument in ancient Rome whose obelisk was once believed to have acted as a sundial gnomon.

(astronomy) A constellation of the southern sky, said to resemble a pendulum clock. It lies between the constellations Fornax and Dorado.  examples

(Christianity) Alternative letter-case form of horologium, the book of hours in the Eastern Orthodox and Catholic churches.  examples