locative singular of ārāma (masculine noun)
Analysis. No analysis needed; simple locative inflection of the noun ārāma.
Etymology. From Sanskrit ārāma, possibly from ā-√ram "to rest, delight" (ā-: toward the speaker; √ram: to enjoy, find rest in). The word denotes a delightful enclosure.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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