Declension table of ?sīdhra

Neuter	Singular	Dual	Plural
Nominative	sīdhram	sīdhre	sīdhrāṇi
Vocative	sīdhra	sīdhre	sīdhrāṇi
Accusative	sīdhram	sīdhre	sīdhrāṇi
Instrumental	sīdhreṇa	sīdhrābhyām	sīdhraiḥ
Dative	sīdhrāya	sīdhrābhyām	sīdhrebhyaḥ
Ablative	sīdhrāt	sīdhrābhyām	sīdhrebhyaḥ
Genitive	sīdhrasya	sīdhrayoḥ	sīdhrāṇām
Locative	sīdhre	sīdhrayoḥ	sīdhreṣu

Compound sīdhra -

Adverb -sīdhram -sīdhrāt