masc nom sg of dukanipāta (noun)
Analysis. duka (two) + nipāta (descent, section, book); a compound denoting the second book or division of a canonical text, from the metaphor of textual matter 'descending' or 'falling' into numbered sections.
Etymology. duka is the dual form of dva (two), from Indo-European *dwo-; nipāta is derived from ni- (down, into) + √pat (to fall), cognate with Latin patere (to lie open, fall). The image is of doctrine or text arranged as successive 'descents' into numbered compartments.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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