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(in prescriptions) four times a day.
Origin of q.i.d.
From the Latin word quater in diē Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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q.i.d. in Medicine

q.i.d. abbr.
Latin quater in die (four times a day)

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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