masc nom sg of theraññatara (adj)
Analysis. thera (elder monk) + ññatara (a certain, some), a compound in which the second member is a pronoun-like adjective meaning 'a certain one' or 'some'.
Etymology. thera from √thar- meaning 'to cross over' (cognate with Sanskrit tarati, Latin trans); ññatara from ña- (to know) + -tara (comparative/indefinite suffix), literally 'somewhat known' or 'some particular one'. In canonical usage, theraññatara identifies a monk of seniority without naming him specifically, common in narrative contexts.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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