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• SD
  SD

  abbreviation

  the intelligence and counterespionage service of the Nazi SS.
• sd.
  sd.

  abbreviation

  sound.
• S/D
  S/D

  abbreviation

  school district.
• s.d.
  s.d.

  abbreviation

  sine die.
• S.D.
  S.D.

  abbreviation

  doctor of science.
• sd
  sd

  abbreviation

  sine die

SD

¹ American  

abbreviation

1. the intelligence and counterespionage service of the Nazi SS.

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SD ² American  

abbreviation

1. sea-damaged.

2. South Dakota (approved especially for use with zip code).

3. Statistics. standard deviation.

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sd. ³ American  

abbreviation

1. sound.

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S/D ⁴ American  

abbreviation

1. school district.

2. sight draft.

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s.d. ⁵ American  

abbreviation

1. sine die.

2. Statistics. standard deviation.

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S.D. ⁶ American  

abbreviation

1. doctor of science.

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S.D. ⁷ American  

abbreviation

1. sea-damaged.

2. senior deacon.

3. South Dakota.

4. special delivery.

5. Statistics. standard deviation.

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SD ¹ British  

abbreviation

1. South Dakota

2. Also: sd.  statistics standard deviation

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abbreviation

1. Swaziland (international car registration)

sd ² British  

abbreviation

1. sine die

2. sound

3. philosophy sense datum

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sd ³ British  

abbreviation

1. Sudan

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Etymology

Origin of SD¹

From the German word Sicherheitsdienst

Origin of S.D.⁶

From Latin Scientiae Doctor

Example Sentences

And all his rhetoric was deplorable: He, without any credible evidence, blames the flu vaccine for potentially triggering his SD.

From Slate • Apr. 18, 2026

There’s a joke on TikTok that one person in every group is the “digital camera friend,” wrangling everyone for photos and handling SD cards and adapters.

From The Wall Street Journal • Oct. 6, 2025

Edward Snowden removed information using a SD memory card he hid on some occasions in a Rubik’s cube.

From Salon • Jun. 30, 2025

Riding for Team SD Worx, the 29-year-old claimed victory in thrilling style by winning a four-way sprint finish ahead of France's Pauline Ferrand-Prevot, Liane Lippert of Germany and Poland's Katarzyna Niewiadoma-Phinney.

From BBC • Apr. 6, 2025

The square which contains WA is in line S, column D. So I put down SD.

From The Treasure-Train by Reeve, Arthur B. (Arthur Benjamin)