[te-truh-sahy-kleen, -klin]
noun Pharmacology.
an antibiotic, C 22 H 24 H 2 O 8 , derived from chlortetracycline, used in medicine to treat a broad variety of infections.

1950–55; tetra- + cycl- + -ine

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World English Dictionary
tetracycline (ˌtɛtrəˈsaɪklaɪn, -klɪn)
an antibiotic synthesized from chlortetracycline or derived from the bacterium Streptomyces viridifaciens: used in treating rickettsial infections and various bacterial infections. Formula: C22H24N2O8
[C20: from tetra- + cycl(ic) + -ine²]

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American Heritage
Medical Dictionary

tetracycline tet·ra·cy·cline (tět'rə-sī'klēn', -klĭn)

  1. A yellow crystalline compound synthesized or derived from certain microorganisms of the genus Streptomyces and used as a broad-spectrum antibiotic.

  2. An antibiotic, such as chlortetracycline and oxytetracycline, having the same basic structure.

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
tetracycline   (tět'rə-sī'klēn', -klĭn)  Pronunciation Key 
A yellow crystalline compound, C22H24N2O8, synthesized or derived from several bacterial species of the genus Streptomyces and used as an antibiotic in bacterial infections. Other drugs of the tetracycline class have a similar chemical structure.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The bones, the researchers say, contain traces of the antibiotic tetracycline.
After three hours of incubation, the resulting microbes were exposed to the
  antibiotic tetracycline.
Arriving at the correct orientation has a reward for each germ: immunity from
  the antibiotic, tetracycline.
First, he convinced a new doctor to prescribe him tetracycline, the preferred
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