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definitions
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t.i.d.

  1. (in prescriptions) three times a day.
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Origin of t.i.d.

From the Latin word ter in diē
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for t.i.d.

t.i.d.

abbreviation for (in prescriptions)
  1. ter in die
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Word Origin

Latin: three times a day
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

t.i.d. in Medicine

t.i.d.

abbr.
  1. ter in die (three times a day)
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.