of or pertaining to diabetes or persons having diabetes.
having or resulting from diabetes.
a person who has diabetes.

1790–1800; diabet(es) + -ic

antidiabetic, adjective
nondiabetic, adjective
undiabetic, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
diabetic (ˌdaɪəˈbɛtɪk)
1.  of, relating to, or having diabetes
2.  for the use of diabetics: diabetic chocolate
3.  a person who has diabetes
usage  Rather than talking about a diabetic or diabetics, it is better to talk about a person with diabetes, people with diabetes

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1799 (adj.), 1840 (n.), from diabetes.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

diabetic di·a·bet·ic (dī'ə-bět'ĭk)

  1. Relating to, having, or resulting from diabetes.

  2. Intended for use by a person with diabetes.

One who has diabetes.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
In hospitals, doctors are using commercially produced, lab-grown skin to repair
  diabetic foot ulcers.
It has enough sugar to keep you drinking but not so much that you fear a
  diabetic coma.
But good diabetic control can prevent or lessen chances of later blindness,
  amputation, stroke and other illnesses.
According to the report, diabetic mice and rats went into remission five days
  after receiving the insulin-encoding gene.
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