infradian

English

Etymology

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

Adjective

infradian (not comparable)

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

Usage notes

The comparative "more infradian" is not used, in contrast to the comparative "more ultradian".

See also

• circadian
• ultradian

Anagrams

• Afrindian