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TeachMeFinance.com - explain arm arm The term 'arm' as it applies to the area of drug testing can be defined as ' Any of the treatment groups in a randomized trial. Most randomized trials have two 'arms,' but some have three 'arms,' or even more (See Randomized Trial)'. Previous 5 Terms: arietine arietinous ARINC aristology arithmetic sequence Next 5 Terms: armigerous ARMS ARND Aromatics ARP About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.