• صِهْر
• يُصْهَرُ

Appears 2 times in the Quran.

1. 22:20 يُصْهَرُ بِهِۦ مَا فِى بُطُونِهِمْ وَٱلْجُلُودُ

   With it shall be melted what is in their bellies and (their) skins as well.
   

2. 25:54 وَهُوَ ٱلَّذِى خَلَقَ مِنَ ٱلْمَآءِ بَشَرًا فَجَعَلَهُۥ نَسَبًا وَصِهْرًا وَكَانَ رَبُّكَ قَدِيرًا

   And He it is Who has created man from the water, then He has made for him blood relationship and marriage relationship, and your Lord is powerful.