[ te-truh-sahy-kleen, -klin ]
/ ˌtɛ trəˈsaɪ klin, -klɪn /
Save This Word!

noun Pharmacology.

an antibiotic, C22H24H2O8, derived from chlortetracycline, used in medicine to treat a broad variety of infections.



Were you ready for a quiz on this topic? Well, here it is! See how well you can differentiate between the uses of "was" vs. "were" in this quiz.
Question 1 of 7
“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

Meet Grammar Coach

Write or paste your essay, email, or story into Grammar Coach and get grammar helpImprove Your Writing

Meet Grammar Coach

Improve Your Writing
Write or paste your essay, email, or story into Grammar Coach and get grammar help

Origin of tetracycline

First recorded in 1950–55; tetra- + cycl- + -ine2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Example sentences from the Web for tetracycline

British Dictionary definitions for 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: C 22 H 24 N 2 O 8

Word Origin for tetracycline

C20: from tetra- + cycl (ic) + -ine ²
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for tetracycline

[ tĕt′rə-sīklēn′, -klĭn ]


A yellow crystalline compound synthesized or derived from certain actinomycetes of the genus Streptomyces and used as a broad-spectrum antibiotic.
An antibiotic, such as 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.

Scientific definitions for tetracycline

[ tĕt′rə-sīklēn′, -klĭn ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.