horology

Etymology

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.

noun

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.