std

noun3

1. •
   Standard library.
2. •
   Abbreviation of standard.

   • Black Firebomb: Explodes upon impact when thrown. More deadly than std bomb. — 2011
3. •
   Abbreviation of standard deviation.

noun4

1. •
   Initialism of sexually transmitted disease.

   • Some studies estimate that as many as one out of every two people might contract an STD at some point in their lives. — 1999
2. •
   Initialism of short-term disability.
3. •
   Initialism of subscriber trunk dialling or subscriber toll dialing.
4. •
   (humorous, rare) Initialism of save the date.