This word is from the Spanish reloj.
re·lós
timekeeping watch
A relós is an instrument for measuring and recording time, especially by mechanical means, usually with hands or changing numbers to indicate the hour and minute. Most often, it refers to a wristwatch.
A clock is more likely to be referred to as orasán.
* Note that the Philippine Language Commission is currently advocating for the preferred standard spelling to be reló.
KAHULUGAN SA TAGALOG
relós:kasangkapang nagsasaad ng oras