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infradian in Medicine

infradian

(ĭn-frādē-ən, ĭn′frə-dēən)
adj.
  1. 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.