al·ler·gic

[uh-lur-jik]
adjective
1.
of or pertaining to allergy: an allergic reaction to wool.
2.
having an allergy.
3.
Informal. having a strong dislike or aversion: He's allergic to most modern music.

Origin:
1910–15; allerg(y) + -ic

un·al·ler·gic, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
allergic (əˈlɜːdʒɪk) [Click for IPA pronunciation guide]
 
adj (foll by to)
1.  of, relating to, having, or caused by an allergy
2.  informal having an aversion (to): he's allergic to work

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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00:10
Allergic is always a great word to know.
So is doohickey. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a gadget; dingus; thingumbob.
Etymonline
Word Origin & History

allergic
1911, from allergy (q.v.); fig. use, "antipathetic, repulsed" is from 1937; first ref. is to Philadelphia scrapple.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

allergic al·ler·gic (ə-lûr'jĭk)
adj.

  1. Of, caused, or characterized by an allergy.

  2. Having an allergy or exhibiting an allergic reaction to a substance.

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
Rarely bacitracin zinc may cause an allergic reaction.
Soon, hypoallergenic felines-cats that have little likelihood of causing an
  allergic reaction in humans-will be available.
Many foods and drinks that are red is causing allergic reaction in people.
Knowing that some allergic reaction is behind alleviates itself, as the mental
  stress is reduced.
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