masc nom sg of saṭṭhihāyana (adj)
Analysis. saṭṭhi (sixty) + hāyana (year); a compound expressing age in years, modelled on the pattern of cardinal + time noun.
Etymology. saṭṭhi is the ordinal form of the number sixty (related to Sanskrit ṣaṣṭi, from Proto-Indo-European *sweks 'six'). hāyana derives from hāya (year), cognate with Sanskrit hāyana and ultimately related to English year (from Proto-Indo-European *yēr- 'to go around', the year as a cycle).
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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