infradian

[ĭn-frādē-ən, ĭn′frə-dēən]

adj.

Relating to biological variations or rhythms occurring in cycles less frequent than every 24 hours.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.