STI
noun
plural STIs
: any of various diseases or infections (such as gonorrhea, genital herpes, chlamydia, hepatitis B, or HIV) that are typically transmitted by direct sexual contact but may sometimes be spread by nonsexual means (such as childbirth or sharing needles)
called also STD
Examples of STI in a Sentence
Recent Examples on the Web
In Broward County, a contract worth more than $2 million supported an STI testing and treatment center operated in partnership with the county health department.
—
Zachary Bynum, CBS News, 13 Apr. 2026
Epstein also said that Gates had wanted to try to give that STI medication to French Gates in secret.
—Ava Berger, NPR, 8 Apr. 2026
Despite these advancements, STI rates in the United States continue to rise.
—Care Resource, Miami Herald, 6 Apr. 2026
Today, the organization provides low- to no-cost HIV/STI treatment and LGBTQ+ care at clinics across Central Illinois.
—Tess Kenny, Chicago Tribune, 5 Apr. 2026
Some centers also provide ultrasounds or STI testing.
—Emily Brindley
health Reporter, Dallas Morning News, 27 Mar. 2026
The panel issues key recommendations on cancer screenings, STI testing, counseling and other preventive services.
—Alexandra Banner, CNN Money, 4 Mar. 2026
The vast majority focus on STI testing and treatment, contraceptive services, and cancer screenings.
—Fiorella Valdesolo, Allure, 3 Mar. 2026
Similarly, science is evolving for STI prevention options.
—Kenneth H. Mayer, STAT, 27 Feb. 2026
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Zachary Bynum, CBS News, 13 Apr. 2026
Epstein also said that Gates had wanted to try to give that STI medication to French Gates in secret.
—Ava Berger, NPR, 8 Apr. 2026
Despite these advancements, STI rates in the United States continue to rise.
—Care Resource, Miami Herald, 6 Apr. 2026
Today, the organization provides low- to no-cost HIV/STI treatment and LGBTQ+ care at clinics across Central Illinois.
—Tess Kenny, Chicago Tribune, 5 Apr. 2026
Some centers also provide ultrasounds or STI testing.
—Emily Brindley
health Reporter, Dallas Morning News, 27 Mar. 2026
The panel issues key recommendations on cancer screenings, STI testing, counseling and other preventive services.
—Alexandra Banner, CNN Money, 4 Mar. 2026
The vast majority focus on STI testing and treatment, contraceptive services, and cancer screenings.
—Fiorella Valdesolo, Allure, 3 Mar. 2026
Similarly, science is evolving for STI prevention options.
—Kenneth H. Mayer, STAT, 27 Feb. 2026
Cite this Entry
“STI.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/STI. Accessed 21 Apr. 2026.
Copy CitationMedical Definition
STI
abbreviation or noun
: any of various diseases or infections (such as gonorrhea, genital herpes, chlamydia, hepatitis B, or HIV) that are typically transmitted by direct sexual contact but may sometimes be spread by nonsexual means (such as childbirth or sharing needles)
called also STD
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