Definition of "sis" [sis]

• Informal Sister. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• ""Te invocavi invoco divum Grabovium pro arce Fisia, pro urbe Iguvina, pro arcis nomine, pro urbis nomine: _volens sis, propitius sis_ arci"
• "Hi trupti nice chutney. my sis is a big fan of this tomatoes. she will take if we give her tomato dishes for a ful week also. hee hee .."
• "I wonder if anything can be done about what I call my sis's 'city-folk complex' ..."