Chlamydia (noun)

1. A sexually transmitted infection caused by the bacterium Chlamydia trachomatis, which can lead to serious health problems if left untreated.
2. A genus of bacterial microorganisms that can cause a range of diseases in humans and animals.

Origin:

The word "chlamydia" is derived from the greek word "chlamys" meaning cloak or mantle. it is first recorded in english in the early 20th century.

Examples:

1. She was diagnosed with chlamydia and had to get treated.
2. Chlamydia is one of the most common sexually transmitted infections.
3. Untreated chlamydia can cause serious health problems including infertility.
4. Regular screening for chlamydia is important for sexual health.
5. Chlamydia is a common cause of eye infections in newborns.