jidhr
جِذْر
root (of a plant); origin, source; the root of a word; a root in mathematics
شقّ جذر الشجرة طريقه بين الصخور.
The tree’s root pushed its way between the rocks.
تشترك كلمتا كتاب ومكتبة في جذر واحد.
The words kitāb (book) and maktabah (library) share the same root.