أَبْوَابٌ
Root: بوب
Full Definition
أَبْوَابٌ
[Kinds, sorts, classes, chapters, heads, or the like, disposed, arranged, distributed, classified, or set in order,] is a phrase similar to أَصْنَافٌ مُصَنَّفَةٌ. You say also كِتَابٌ مُبَوَّبٌ [A book disposed in, or divided into, distinct chapters].