infradian.
Cyclical with a periodicity significantly longer than 24 hours, that is, less frequent than circadian.
Meaning & usage
Cyclical with a periodicity significantly longer than 24 hours, that is, less frequent than circadian.
Where this word comes from
Uncertain. Possibly from the Latin infra (“below”) and diēs (“a day”) with the English suffix -an. Compare circadian, ultradian, and infra etc.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.