Declension table of ?vimithuna

Neuter	Singular	Dual	Plural
Nominative	vimithunam	vimithune	vimithunāni
Vocative	vimithuna	vimithune	vimithunāni
Accusative	vimithunam	vimithune	vimithunāni
Instrumental	vimithunena	vimithunābhyām	vimithunaiḥ
Dative	vimithunāya	vimithunābhyām	vimithunebhyaḥ
Ablative	vimithunāt	vimithunābhyām	vimithunebhyaḥ
Genitive	vimithunasya	vimithunayoḥ	vimithunānām
Locative	vimithune	vimithunayoḥ	vimithuneṣu

Compound vimithuna -

Adverb -vimithunam -vimithunāt