قرائب
Is the word قرائب just a feminine plural for قريبة and simply means "female relatives", or does it have another more general meaning?

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Also it means close. For example,
مطاعم قريبة من المنزل
In Libyan dialect, we pronounce ق as G sound to mean close while ق to mean a relative.

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addition:
when we speak about relatives, قرائب used for both  Feminine and masculine. but قريبات is more used as feminine plural.

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This is first time that I hear(  قرائب ) قريبة - قريبات / قريب -  أقارب indicate the person(m./f.)who has a familiar relationship with someone else.
  The noun,infinitive is: القرابة

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المذكر : قريب، الجمع : قريبون، أَقْرِبَاءُ ، قُرَابَى ، قَرَائِبُ ، 
المؤنث : قريب و قريبة ، و الجمع للمؤنث : قريبات وقرائِبُ
هذا من معجم المعاني

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What is the singular form of قرائب then?

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