هُمَزَةٍ

A word in the Arabic language will either be 1) a verb or 2) a noun or 3) a particle – هُمَزَةٍ is a noun

A noun may either be 1) Definite or indefinite 2) Masculine or feminine 3) Singular, dual or plural 4) Nominative, accusative or genitive

هُمَزَةٌ is the natural state of this indefinite noun and it becomes هُمَزَةٍ due to: 1) a preposition that precedes it or 2) a possessed noun that precedes it or 3) it’s a noun of dependent declension a) نَعْتٌ / صِفَطٌ adjectives b) التَّوْكِيْدُ emphatic c) المَعْطُوْفٌ conjunction d) البَدَلُ synonym

Slanderer, back biter

To backbite, defame, push back with a blow, pinch, repel, find fault with, suggest evil, break, throw (on the ground), squeeze, bite

 

Surah/Below is the only verse in the holy Quran containing the indefinite, genitive nounهُمَزَةٍ
Verse
104-1Woe to every slanderer and backbiterوَيْلٌ لِّكُلِّ هُمَزَةٍ لُّمَزَةٍ