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ad lib.

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  1. ad libitum.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

ad lib. in Medicine

ad lib.

abbr.
  1. ad libitum (freely, as desired)
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.