Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A large wooden or metal ball that drops at a predetermined time to enable sailors to check their marine chronometers from their boats offshore.

from the GNU version of the Collaborative International Dictionary of English

  • n. a ball arranged to drop from the summit of a pole, to indicate true midday time, as at Greenwich Observatory, England.

Etymologies

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