Declension table of ?prastira

Masculine	Singular	Dual	Plural
Nominative	prastiraḥ	prastirau	prastirāḥ
Vocative	prastira	prastirau	prastirāḥ
Accusative	prastiram	prastirau	prastirān
Instrumental	prastireṇa	prastirābhyām	prastiraiḥ prastirebhiḥ
Dative	prastirāya	prastirābhyām	prastirebhyaḥ
Ablative	prastirāt	prastirābhyām	prastirebhyaḥ
Genitive	prastirasya	prastirayoḥ	prastirāṇām
Locative	prastire	prastirayoḥ	prastireṣu

Compound prastira -

Adverb -prastiram -prastirāt