Sis meaning

sĭs
(UK) Secret Intelligence Service.
initialism
3
0
(informal) Shortened form of sister.
noun
1
0
Sister.
noun
0
0
Forming nouns of action or process.
suffix
0
0
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(medicine) Form noun of condition.
suffix
0
0
noun
0
1

Origin of sis

  • Ultimately from Ancient Greek -σις (-sis, “forms noun of action”), often via Latin or French.

    From Wiktionary