ب ع ضb-ʿ-ḍ
(ض) بَعَضَ يَبْعِضُ بَعْضًاbaʿaḍa yabʿiḍu baʿḍan: to cut a thing into pieces, to cut off a part; some lexicographers have connected it with بَعُوضَةbaʿūḍah (mosquito), by association with biting.
بَعْضbaʿḍ (noun, ism dhāt): a part of a whole; it always occurs as an annexed noun (muḍāf) or indefinite, and in repetition it is used for a reciprocal relation. ﴿بَعْضُكُمْ لِبَعْضٍ عَدُوٌّ﴾ (Al-Baqarah 2:36); ﴿ظُلُمٰتٌۢ بَعْضُهَا فَوْقَ بَعْضٍ﴾ (An-Nūr 24:40)
بَعُوْضَةٌbaʿūḍah: mosquito. ﴿مَثَلًا مَّا بَعُوْضَةً فَمَا فَوْقَهَا﴾ (Al-Baqarah 2:26)