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 the show, The Beauty is an STI that transforms a person into someone physically perfect, but with deadly consequences.
—
Barry Levitt, Time, 22 Jan. 2026
Experts told Flow Space that these approvals are major shots across the bow in the fight against increasing STI rates.
—Helen Carefoot, Flow Space, 30 Dec. 2025
The Mecklenburg County Public Health Department has also provided STI testing and education to 54 individuals — some unhoused, others not.
—Briah Lumpkins, Charlotte Observer, 5 Dec. 2025
The latter includes the 2014 Subaru Impreza WRX STI, one of the last cars driven by Paul Walker in the Fast & Furious movies.
—Lydia Mansel, Travel + Leisure, 30 Nov. 2025
Only one of the five public health nurses needed to fully staff the STI clinic remains with the health department, a spokesperson said.
—Sarah Volpenhein, jsonline.com, 13 Nov. 2025
The biggest announcement at this year’s Tokyo Motor Show—now called the Japan Mobility Show—might be the new Corolla concept, the new Subaru WRX STI hatchback, or several new Lexus LS variants.
—Erik Shilling, Robb Report, 12 Nov. 2025
Spoken by Milan to Allura while waiting for STI tests from a doctor supposedly not accepting new patients before 2040.
—David Rooney, HollywoodReporter, 10 Nov. 2025
In men, the STI can inflame the epididymis, also sometimes causing infertility.
—Daryl Austin, USA Today, 10 Oct. 2025
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Barry Levitt, Time, 22 Jan. 2026
Experts told Flow Space that these approvals are major shots across the bow in the fight against increasing STI rates.
—Helen Carefoot, Flow Space, 30 Dec. 2025
The Mecklenburg County Public Health Department has also provided STI testing and education to 54 individuals — some unhoused, others not.
—Briah Lumpkins, Charlotte Observer, 5 Dec. 2025
The latter includes the 2014 Subaru Impreza WRX STI, one of the last cars driven by Paul Walker in the Fast & Furious movies.
—Lydia Mansel, Travel + Leisure, 30 Nov. 2025
Only one of the five public health nurses needed to fully staff the STI clinic remains with the health department, a spokesperson said.
—Sarah Volpenhein, jsonline.com, 13 Nov. 2025
The biggest announcement at this year’s Tokyo Motor Show—now called the Japan Mobility Show—might be the new Corolla concept, the new Subaru WRX STI hatchback, or several new Lexus LS variants.
—Erik Shilling, Robb Report, 12 Nov. 2025
Spoken by Milan to Allura while waiting for STI tests from a doctor supposedly not accepting new patients before 2040.
—David Rooney, HollywoodReporter, 10 Nov. 2025
In men, the STI can inflame the epididymis, also sometimes causing infertility.
—Daryl Austin, USA Today, 10 Oct. 2025
Cite this Entry
“STI.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/STI. Accessed 7 Feb. 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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