accusative plural neuter of appamāṇābhāna (immeasurable-radiance), a compound noun
Analysis. appamāṇa (immeasurable) + ābhāna (radiance); appamāṇa = a- (not) + pamāṇa (measure, standard); ābhāna from ā- (toward, outward) + √bhā (shine).
Etymology. a- + pramāṇa (Sanskrit measure, standard) and ā- + √bhāti (shine); cognate with Greek phainesthai (appear) and English beam. The compound denotes boundless luminosity, esp. in meditative states.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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