a substance injected through the skin, as bee-sting venom or penicillin administered by injection, that causes an allergic reaction.

1945–50; inject + -ant Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

injectant in·jec·tant (ĭn-jěk'tənt)
A substance injected, as into the skin.

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
Natural gas has been a common injectant used in this country.
Existing low pressure oil, water injection, gas lift and possibly miscible injectant lines will be shared.
Producers will be converted to injector service as necessary in order to provide pressure support and minimize injectant cycling.
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