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The Collaborative International Dictionary
Horometry

Horometry \Ho*rom"e*try\, n. [Cf. F. horom['e]trie. See Horometer.] The art, practice, or method of measuring time by hours and subordinate divisions. ``The horometry of antiquity.''
--Sir T. Browne.

Douglas Harper's Etymology Dictionary
horometry

"measurement of time," 1560s, from Greek hora (see hour) + -metry. Related: Horometrical.

Wiktionary
horometry

n. The art or practice of measure time by hours and subordinate divisions.

Wikipedia
Horometry

Horometry is the art, practice or method by which time is measured in hours or by smaller units. By this account, a " horometer" is an instrument that measures time.