zo·o·log·i·cal (z???-l?j??-k?l) also zo·o·log·ic (-l?j??k)adj.1. Of or relating to animals or animal life.2. Of or relating to the science of zoology.zo?o·log?i·cal·ly adv.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.