C2 noun #73,164 most common

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

time-ball in 30 Seconds

  • (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.

Meanings

  1. 1
    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.
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