nocturnal

nocturnal definition - medical

noc·tur·nal (nŏk-tûrˈnəl)

adjective
  1. Of, relating to, or occurring in the night.
  2. Most active at night.

The American Heritage® Medical Dictionary Copyright © 2009 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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