Declension table of ?mahādvandva

Masculine	Singular	Dual	Plural
Nominative	mahādvandvaḥ	mahādvandvau	mahādvandvāḥ
Vocative	mahādvandva	mahādvandvau	mahādvandvāḥ
Accusative	mahādvandvam	mahādvandvau	mahādvandvān
Instrumental	mahādvandvena	mahādvandvābhyām	mahādvandvaiḥ mahādvandvebhiḥ
Dative	mahādvandvāya	mahādvandvābhyām	mahādvandvebhyaḥ
Ablative	mahādvandvāt	mahādvandvābhyām	mahādvandvebhyaḥ
Genitive	mahādvandvasya	mahādvandvayoḥ	mahādvandvānām
Locative	mahādvandve	mahādvandvayoḥ	mahādvandveṣu

Compound mahādvandva -

Adverb -mahādvandvam -mahādvandvāt