masc voc sg of bāhiya (noun)
Etymology. From √bāhira 'external, outside', related to Sanskrit bāhya. The name Bāhiya Dārucīriya ('the woodworm ascetic from outside') suggests a wanderer or outsider who came to the Buddha's teaching from beyond the monastic fold. The concrete spatial sense of 'outside' underlies the social sense of 'foreigner'.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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