chla·​myd·​ia | \ klə-ˈmi-dē-ə How to pronounce chlamydia (audio) \
plural chlamydiae\ klə-​ˈmi-​dē-​ˌē How to pronounce chlamydiae (audio) \

Definition of chlamydia

1 : any of a genus (Chlamydia, family Chlamydiaceae) of spherical gram-negative intracellular bacteria especially : one (C. trachomatis) that causes or is associated with various diseases of the eye and urogenital tract including trachoma, lymphogranuloma venereum, cervicitis, and some forms of urethritis
2 : a disease or infection caused by chlamydiae

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Other Words from chlamydia

chlamydial \ klə-​ˈmi-​dē-​əl How to pronounce chlamydial (audio) \ adjective

Examples of chlamydia in a Sentence

Recent Examples on the Web Evofem is planning to start a pivotal study of the gel for the potential prevention of chlamydia and gonorrhea in women later this year, which could also boost its appeal to users and investors. Fortune, "Birth control gel approved as first no-hormone option in decades," 22 May 2020 As of mid-2019, Cepheid’s GeneXpert system was cleared to test multiple types of samples for chlamydia, gonorrhea, and trichomoniasis. Mark Hay, Fortune, "Binx aims to capture a milestone in STI testing technology," 21 Apr. 2020 This is the first clinical trial for a vaccine for genital chlamydia and represents the latest development in 15 years of research, according to an SSI statement. Jack Guy, CNN, "A chlamydia vaccine has been successfully tested in an early trial," 13 Aug. 2019 Research into vaccines against herpes and HIV is advanced, while immunizations for chlamydia, gonorrhea, syphilis and trichomoniasis, another common STI, are in earlier stages of development. Jason Gale | Bloomberg, Washington Post, "Why Sex-Related Infections Are Spreading Again," 19 July 2019 STIs like herpes, gonorrhea, chlamydia, and mycoplasma can also infect and irritate the urethra, the Mayo Clinic explains (so treating the STI could potentially address your UTI as well). Patia Braithwaite, SELF, "Is It a UTI or Yeast Infection? Here's How to Tell the Difference," 3 Feb. 2020 And, as De Gabriele notes, other factors aside from fire play into the dwindling koala population—including chlamydia (which results in infertility), other wildlife attacks, and the effects climate change is having on eucalyptus trees themselves. Claire Gallam, Condé Nast Traveler, "How a Wildlife Sanctuary Is Dealing With Australia's Bushfires," 11 Feb. 2020 Kangaroo Island is one of few places in the country where koalas have largely been untouched by chlamydia. Jennifer Leman, Popular Mechanics, "Planes Are Dropping Vegetables to Save Australia's Starving Animals," 13 Jan. 2020 Antibiotics can cure syphilis, gonorrhea, and chlamydia, but the diseases must be caught early and not left untreated. Brian Pascus, CBS News, "CDC raises alarm about "growing STD epidemic" as cases hit record high," 9 Oct. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'chlamydia.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of chlamydia

1966, in the meaning defined at sense 1

History and Etymology for chlamydia

New Latin, from Greek chlamyd-, chlamys

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Time Traveler for chlamydia

Time Traveler

The first known use of chlamydia was in 1966

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Statistics for chlamydia

Last Updated

14 Jun 2020

Cite this Entry

“Chlamydia.” Dictionary, Merriam-Webster, Accessed 6 Aug. 2020.

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chla·​myd·​ia | \ klə-ˈmid-ē-ə How to pronounce chlamydia (audio) \

Medical Definition of chlamydia

1 capitalized : the type genus of the family Chlamydiaceae comprising coccoid to spherical gram-negative intracellular parasitic bacteria and including one (C. trachomatis) that causes or is associated with various diseases of the eye and genitourinary tract including trachoma, lymphogranuloma venereum, cervicitis, and some forms of nongonococcal urethritis
2 plural chlamydiae\ -​ē-​ˌē, -​ˌī How to pronounce chlamydiae (audio) \ also chlamydias
a : a bacterium of the genus Chlamydia
b : an infection or disease caused by a bacterium of the genus Chlamydia

Other Words from chlamydia

chlamydial \ -​ē-​əl How to pronounce chlamydial (audio) \ adjective

More from Merriam-Webster on chlamydia

Rhyming Dictionary: Words that rhyme with chlamydia Encyclopedia article about chlamydia

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