time-ball
From WikiWord, the free dictionary
English
Definitions
noun
- A large wooden or metal ball that drops at a predetermined time to enable sailors to check their marine chronometers from their boats offshore.
Related words
Synonyms
time ballbellballahoubellsdutchman's logmarine chronometership's bellstimenoguybow ballwatch in twoheel-and-toetelltalecenterboardballingerlog-glasstraverse board