accusative singular masculine of the compound khīṇāsava-ssetaṁ (one whose taints are exhausted), but this appears to be a contracted/compressed form; resolution uncertain from the surface form alone. The stem seems to be khīṇāsava (taints destroyed) + a dative or locative postposition or suffix.
Analysis. khīṇa (exhausted, past participle of khīyati 'wastes away') + āsava (taints, fluxes of craving and ignorance) + ssetaṁ (possibly a contraction or sandhi fusion involving a demonstrative or locative particle; the exact grammatical function is obscured by the surface form).
Etymology. khīṇa from √khī 'to waste, diminish' (related to Sanskrit kṣaya 'decay'; Indo-European *ksei- 'cut, split'); āsava from √as 'to flow' (Sanskrit āsrava; cognate with Greek rheo 'to flow'). The compound denotes the consummation of the Buddhist path: the destruction of the three āsavas (sensual desire, becoming, and ignorance).
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
Lite mode — plain HTML for e-readers and old browsers. Full version