Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “STD”

STD

noun uk   /ˌes.tiːˈdiː/ us  

STD noun (DISEASE)

[C] abbreviation for sexually transmitted diseaseDiseases of the reproductive system

STD noun (PHONE)

[U] abbreviation for subscriber trunk dialling: a system in the UK and Australia by which people make phone calls over long distancesCommunicating by telephone
(Definition of STD noun from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of STD?
Add Cambridge dictionaries to your browser to your website

Definitions of “STD” in other dictionaries

Word of the Day

beer mat

a small piece of cardboard that you put under a glass to protect a table surface in a pub or bar

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More