Sis
noun, Informal.
1.
sister.
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.
noun
1.
(informal) short for sister
interjection
1.
(South African, informal) an exclamation of disgust
abbreviation
1.
Also called MI6. (in Britain) Secret Intelligence Service
2.
(in New Zealand) Security Intelligence Service
sink-or-swim
SIS
National Library of Medicine [Specialized Information Services]
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