Declension table of ?ātra

Neuter	Singular	Dual	Plural
Nominative	ātram	ātre	ātrāṇi
Vocative	ātra	ātre	ātrāṇi
Accusative	ātram	ātre	ātrāṇi
Instrumental	ātreṇa	ātrābhyām	ātraiḥ
Dative	ātrāya	ātrābhyām	ātrebhyaḥ
Ablative	ātrāt	ātrābhyām	ātrebhyaḥ
Genitive	ātrasya	ātrayoḥ	ātrāṇām
Locative	ātre	ātrayoḥ	ātreṣu

Compound ātra -

Adverb -ātram -ātrāt