infradian

I1N1F4R1A1D2I1A1N1

adjective

Cyclical with a periodicity significantly longer than 24 hours, that is, less frequent than circadian.

OriginLatin infra →
Scrabble 13
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Meanings

adjectiveinfradian (not comparable)
  1. not comparableCyclical with a periodicity significantly longer than 24 hours, that is, less frequent than circadian.

Origin

  1. Latininfra“below”
  2. Englishinfradian

Uncertain. Possibly from the Latin infra (“below”) and diēs (“a day”) with the English suffix -an. Compare circadian, ultradian, and infra etc.

More words from Latin

Full word history & related roots →
Cite this entry
APA

infradian. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/infradian

MLA

“infradian.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/infradian. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “infradian,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/infradian.

Source: infradian on Wiktionary, CC BY-SA 4.0.