Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A constellation in the Southern Hemisphere near Hydrus, Eridanus, and Reticulum.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • proper n. A constellation of the southern sky, said to resemble a pendulum clock. It lies between the constellations Fornax and Dorado.

from The Century Dictionary and Cyclopedia

  • n. A clock.
  • n. Same as horology, 2.
  • n. [capitalized] A southern constellation of twelve stars, inserted by Lacaille east of Eridanus. Its brightest star is of the fourth magnitude.
  • n. In botany, a table of the hours at which the flowers of certain plants open and close in a given locality.

Etymologies

Latin hōrologium, horologe; see horologe.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Named by the French astronomer Nicolas Louis de Lacaille in 1763. Originally called Hōrologium Oscillitorium (Latin for "pendulum clock") to honor the Dutch astronomer and mathematician Christian Huygens, inventor of the pendulum clock. (Wiktionary)

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