accusative singular neuter of suttara, or adverbial form (resolving spelling sauttaraṁ to suttara)
Analysis. su- (well, good) + uttara (higher, further, subsequent) — 'well-gone-beyond' or 'well-passed-through', used in canonical contexts to mean 'by way of the higher teachings' or 'scripturally'.
Etymology. su- (well, cognate with Greek eu-) + uttara (from ut- 'out' + -tara comparative suffix); literally 'well-passed', idiomatically 'by scripture'.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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