The word "寅时" is formed by combining the character "寅", representing the third Earthly Branch in the traditional Chinese system, with "时", meaning "time" or "hour". In this context, each Earthly Branch corresponds to a specific two-hour period in the day, and "寅" is assigned to the segment from 3 a.m. to 5 a.m. Thus, the compound directly denotes this time interval through the explicit pairing of the branch identifier with the general time character.