Definition of STI noun from the Oxford Advanced American Dictionary

 

STI

 noun
noun
NAmE//ˌɛs ti ˈaɪ//
 
 
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the abbreviation forsexually transmitted infection(an infection that is passed from one person to another during sexual activity) a fact sheet on the symptoms and treatment of STIs STIs cause a wide range of illnesses
See the Oxford Advanced Learner's Dictionary entry: STI