hor·o·loge 
(hôrə-lōj′, hŏr-)
(hôrə-lōj′, hŏr-)n.
A device, such as a clock or sundial, used in telling time.
[Middle English orloge, from Old French, from Latin hōrologium, from Greek hōrologion : hōrā, hour, season; see yēr- in the Appendix of Indo-European roots + legein, to speak; see leg- in the Appendix of Indo-European roots.]