[sahy-kluh-spawr-een, -in, -spohr-, sik-luh-]
noun Pharmacology.
a substance, synthesized by certain soil fungi, that suppresses the immune response by disabling helper T cells, used to minimize rejection of foreign tissue transplants.
Also, cyclosporin [sahy-kluh-spawr-in, -spohr-, sik-luh-] .

1975–80; < Neo-Latin Cyclospor(eae) a class of brown algae (see cyclo-, -spore, -eae) + -in2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

cyclosporine cy·clo·spor·ine (sī'klə-spôr'ēn, -ĭn) or cy·clo·spor·in A (-ĭn)
A cyclic oligopeptide immunosuppressant produced by fungus and used to inhibit organ transplant rejection.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
cyclosporine (sī'klə-spôr'ēn, -ĭn) also cyclosporin   (sī'klə-spôr'ēn, -ĭn)  Pronunciation Key 
A polypeptide obtained from any of various deuteromycete fungi, used as an immunosuppressive drug to prevent the rejection of transplanted organs.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Another potential problem is an inflammatory reaction that can be treated with
  eyedrops containing cyclosporine.
These medicines include corticosteroids, cyclosporine, and methotrexate.
Other medicines that have been used include cyclosporine and chlorambucil.
Some patients will receive high doses of corticosteroids or a drug called
  cyclosporine to suppress their immune system.
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