• Bengali Word নিদান English definition (noun) 1 first/primary cause. 2 cause of existence; any cause/motive; root cause. 3 cause of a disease and inquiry into it; pathology; actiology. 4 diagnosis. 5 cessation; end. 6 purification; correctness. 7 symptoms of imminent death. নিদানকাল (noun) time of death; last hour; dying day. নিদানতত্ত্ব, নিদানবিদ্যা (noun(s) pathology; actiology; diagnostics. নিদান পক্ষে (adverb) at least; at the lowest; perforce; still. নিদানভূত (adjective) become a primary/remote cause (of a disease); causative; causal. নিদানশালা (noun) clinic. নিদানশাস্ত্র = নিদানতত্ত্ব.