Meanings
noun400-day clock (plural 400-day clocks)
plural 400-day clocks
- Synonym of anniversary clock.
Synonyms: anniversary clock
Synonyms & antonyms
nounSynonym of anniversary clock.
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Also see
Origin
So called because such clocks might run for more than a year on a single winding.
Full word history & related roots →Cite this entry
APA
400-day clock. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/400-day%20clock
MLA
“400-day clock.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/400-day%20clock. Accessed November 4, 2026.
Chicago
WatkinsX Dictionary, s.v. “400-day clock,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/400-day%20clock.
Source: 400-day clock on Wiktionary, CC BY-SA 4.0.