An Etymological Dictionary of Astronomy and Astrophysics

The Clock. A faint constellation in the southern hemisphere, at about 3h right ascension, 55° south declination. Its brightest star, α Horologii, is of magnitude 3.9. Abbreviation: Hor; Genitive: Horologii.

Etymology (EN): Horologium “clock,” from L., from Gk. horologion, from horolog(os) “timeteller,” from horo-, combining form of hora “hour” (→ year)

• -log-, stem of legein “to speak, tell” (+ -os adj. suffix) + -ion diminutive suffix.
  Originally named Horologium Oscillitorium by Abbé Nicolas Louis de Lacaille (1713-1762) to honour the inventor of the pendulum clock, Christian Huygens (1629-1695).

Etymology (PE): Sâ’at “clock,” from Ar.