masc nom sg of nisinna (pp)
Etymology. ni- (down, into) + √sad (sit): the root sat/sad means 'to sit' and appears in English 'seat', Latin 'sedēre', Sanskrit 'sad'. The prefix ni- (down, into) intensifies the sense of settling down into a seated position. Cognate: English 'sit' (from *sed-).
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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