Infradian

adj

adj ·Rare ·Advanced level

Definitions

Adjective
  1. 1
    Cyclical with a periodicity significantly longer than 24 hours, that is, less frequent than circadian. not-comparable

Etymology

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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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.