We found one dictionary that defines the word six-hour clock:

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1. Six-hour clock: Wikipedia, the Free Encyclopedia

▸ Words similar to six-hour clock ▸ Usage examples for six-hour clock ▸ Idioms related to six-hour clock ▸ Wikipedia articles (New!) ▸ Words that often appear near six-hour clock ▸ Rhymes of six-hour clock ▸ Invented words related to six-hour clock