masc nom sg of nipāta (noun); masc nom sg of nipāta (adj)
Analysis. ni- (prefix, down, into) + pāta (root √pat, falling). A thing that falls down: used literally for a descent or drop, and figuratively for a grammatical form that 'falls' outside normal inflection (an indeclinable), and for a section of text that 'divides' a work.
Etymology. From ni- (down, into) + √pat (to fall, fly). The root √pat is cognate with Latin patēre (to lie open, extend) and English feather (from the sense of something light and falling). The prefix ni- gives the downward motion; nipāta is the concrete image of something falling down, applied abstractly to grammatical particles that stand outside the inflectional paradigm.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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