hōrŏlŏgĭum, ĭi, n., = ὡρολόγιον,
a clock , horologe , either a sundial or a waterclock , Plin. 2, 76, 78, § 187; 7, 60, 60, § 213; Varr. R. R. 3, 5, 17; Cic. Fam. 16, 18, 2; Vitr. 9, 8 sq.; Inscr. Orell. 2032; 3298 sq.
hōrologium ī, n , ὡρολόγιον, a clock, horologe, sun-dial, water-clock. ...
An Elementary Latin Dictionary