Definition of STD in English:

STD

Syllabification: STD

noun

A sexually transmitted disease.

abbreviation

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1Doctor of Sacred Theology.
[from Latin Sanctae Theologiae Doctor]
1.1British Subscriber trunk dialing.

Definition of STD in:

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Word of the day animalcule
Pronunciation: ˌanəˈmalˌkyo͞ol
noun
a microscopic animal