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• sis
  sis

  noun

  sister.
• -sis
  -sis

  a suffix appearing in loanwords from Greek, where it was used to form from verbs abstract nouns of action, process, state, condition, etc..
• SIS
  SIS

  abbreviation

  (in Britain) Secret Intelligence Service

sis

¹ American  

[sis] / sɪs /

noun

Informal.

1. sister.

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-sis ² American  

1. a suffix appearing in loanwords from Greek, where it was used to form from verbs abstract nouns of action, process, state, condition, etc..

   thesis; aphesis.

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SIS ¹ British  

abbreviation

1. Also called: MI6.  (in Britain) Secret Intelligence Service

2. (in New Zealand) Security Intelligence Service

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sis ² British  

/ sɪs /

noun

1. informal short for sister

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sis ³ British  

/ siːs, sɪs /

interjection

1. informal an exclamation of disgust

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Etymology

Origin of sis¹

1825–35, shortened form; compare Dutch zus for zuster sister

Origin of -sis²

From Greek

Example Sentences

You’ve said your sis won’t stop harping on your solution, which suggests there’s a deeper issue here.

From Slate • Mar. 20, 2024

She won best new artist at the VMAs where she was photographed being giggly with "big sis" Swift.

From Salon • Oct. 5, 2023

But your sis and brother-in-law didn’t “hurt” him in the sense of showing malice or intending harm.

From Washington Post • Feb. 28, 2023

Dee and Lee’s youngest boy sleeping in their bedroom till he’s 5 or 6, then sharing a room with his big sis.

From New York Times • Dec. 27, 2022

“Nah, my mom and sis did all the hard work.”

From "Legendary Frybread Drive-In" by Cynthia Leitich Smith

Related Words

• buddy
• comrade
• crony
• playmate