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sis

[sis]
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noun Informal.

sister.

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You should capitalize these when referring to your own relatives: Hello, Mother. A good rule to follow is to capitalize them if they are used as proper nouns. If used as common nouns, don’t capitalize as in: We honor all mothers in May. In other words, capitalize words such as “Mother,” “Father,” “Grandmother,” “Grandfather,” “Son,” “Daughter,” and “Sis” when they are used in place of …
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RELATED WORDS

crony, comrade, buddy, playmate, amigo, sidekick, associate, chum, brother, homeboy, companion, mate, sister, homegirl, pal, connate, amiga, bro, cuz, co-mate

Origin of sis

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

-sis

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.

Origin of -sis

From Greek
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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Contemporary Examples of sis

Historical Examples of sis

British Dictionary definitions for sis

sis

1

noun

informal short for sister

sis

2

sies

interjection

Southern African informal an exclamation of disgust

Word Origin for sis

Afrikaans, possibly from Khoi

SIS

abbreviation for

Also called: MI6 (in Britain) Secret Intelligence Service
(in New Zealand) Security Intelligence Service
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for sis
n.

1650s, abbreviated form of sister; in American English, applied generally to girls and young women (1859). It also was the familiar short form of Cecilie, Cicely, a common name for girls in the Middle English period.

-sis

suffix in Greek-derived nouns denoting action, process, state, condition, from Greek -sis, which is identical in meaning with Latin -entia, English -ing (1).

Online Etymology Dictionary, © 2010 Douglas Harper