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Meaning of sis

sis

Pronunciation: (sis), [key]
— n. Informal.
  1. sister.

-sis

Pronunciation: [key]
  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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also:
  • sis (Thesaurus)