accusative singular masculine of the compound nibbānagamana (adjective / noun)
Analysis. nibbāna (nirvana, the extinguishing) + gamana (going, path; from √gam "to go"). A descriptive compound: "going toward nirvana" or "that which leads to nirvana."
Etymology. nibbāna < Skt. nirvāṇa: nis- (out, away) + vāna (blowing, from √vā "to blow"), lit. "the fire blown out"; gamana < √gam, cognate with English "come" and Greek βαίνω (baínō). The compound expresses the doctrinal goal—the path or practice that conduces to the cessation of suffering.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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