masc instr sg of vitthāra (adj); nt instr sg of vitthāra (adj); masc instr sg of vitthāra (noun)
Analysis. vi + tthāra: the prefix vi- (apart, asunder) intensifies tthāra (spread), making 'spread apart' → 'spread out in detail'; used adverbially to mean 'in an extended or detailed manner'.
Etymology. From vi- (asunder, apart; intensive) + tthāra, a variant of tharati (to spread, stretch). The root √thar- is cognate with Sanskrit tharati and ultimately with Greek tarássō (to trouble, disturb) and Latin terrae (earth, ground as something spread out). The concrete imagery of spreading or stretching apart underlies the abstract sense of detailed exposition or thoroughness.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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