Question Summary:
Please define the term istihadha. Is it allowed to have sexual intercourse with istihadha?

Question Detail:

Please define the term istihadha. Is it allowed to have sexual intercourse with istihadha?

Answer :

In the name of Allah, Most Gracious, Most Merciful

Assalaamu `alaykum waRahmatullahi Wabarakatuh
 
Istihādah is the state of a woman if she bleeds for less than three days and three nights or more than ten days and ten nights.  Such a woman will make a fresh wudū for each salāh time and her wudū will be valid, despite her bleeding, until the salāh time ends.  However, if any event which breaks the wudū takes place, such as using the bathroom or passing wind, then the wudū will break as normal. 
 
It is permissible for a woman in the state of istihādah to pray, fast, and have sexual intercourse. 
 
(Heavenly Ornaments, “Haid and Istihaada,” pg. 88-94; Zam Zam)
And Allah knows best
Wassalaamu `alaykum
Ml. Abrar Mirza,
Student Darul Iftaa
Checked and Approved by:
Mufti Ebrahim Desai
Darul Iftaa, Madrassah In'aamiyyah