horology

From Latin horologia, from horo- + -logia, equivalent to Ancient Greek ὥρα (hṓra, “period of time, hour”) + -λογία (-logía, “-ology: study or proper knowledge of”). Equivalent to horo- +‎ -ology.

horology (usually uncountable, plural horologies)

1. The study of time, particularly:
   1. The art, science, and technology of making and maintaining timekeeping devices such as clocks, watches and sundials.
   2. (Eastern Orthodoxy) The book of the offices for the canonical hours.

• chronometry, chronometrics

• chronometric, chronometrical, chronometrically