قَدْحًا

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

قَدْحٌ is the natural state of this indefinite noun and it changes to قَدْحًا due to it being the: 1) المَفْعُوْلُ بِهِ object of a verb or 2) اسْمُ of إِنَّ or 3) خَبَرُ of كَانَ or 4) المَفْعُوْلُ فِيْهِ adverb of time or place or 5) المَفْعُوْلُ لَهُ noun that gives the reason for doing a thing or 6) المَفْعُوْلُ مَعَهُ noun that comes after the و which means “along with” or 7) المَفْعُوْلُ المُطْلَقُ is the مَصْدَرٌ of the verb occurring in the sentence or 8) الحَالُ adverb of manner or 9) التَّمْيِيْزُ noun that specifies the meaning of a vague word or 10) المُسْتَثْنَى noun that comes after إِلَّا meaning “except” or 11) المُنَادَى noun of calling or 12) it’s a noun of dependent declension a) نَعْتٌ / صِفَطٌ adjectives b) التَّوْكِيْدُ emphatic c) المَعْطُوْفٌ conjunction d) البَدَلُ synonym

Striking of fire

To dash or strike fire with (a steel)

نَكِرَةٌمُفْرَدٌمُذَكَّرٌمَنْصُوْبٌق د حبَابٌ فَتَحَ قَدَحَ يَقْدَحُفَعْلٌاسْمٌالْمَصْدَرُ
IndefiniteSingularMasculineAccusativeRootStriking فPatternNounVerbal noun
Surah/Below is the only verse in the holy Quran containing the indefinite, accusative nounقَدْحًا
Verse 
100-2and the strikers strikingفَالْمُوْرِيَاتِ قَدْحًا