A timepiece is a horologe
horologe definition by Webster's New World
Origin: Middle English ; from Old French ; from Classical Latin horologium ; from Classical Greek hōrologion ; from hōra, hour plush legein, to say: see logic
horologe definition by American Heritage Dictionary
Origin: Middle English orloge, from Old French, from Latin hōrologium, from Greek hōrologion : hōrā, hour, season; see yēr- in Indo-European roots + legein, to speak; see leg- in Indo-European roots.