'bru

1) grain; 2) every kernel or bit; 3) [seed] [syllable]; 4) letter; 5) word; 6) fruit tree; 7) spy/ search/ pry out [IW]

1) seed, grain, kernel, crops, 2) seed syllable, letter; 3) to scrutinize; probe, pluck out [RY]

1) grain; 2) every kernel or bit; 3) [seed] [syllable]; 4) letter; 5) word (6) fruit tree (7) spy/ search/ pry out)/ [wheat barley and beans etc, phyis su rtsam rgyur mkho bed spyod shas che stabs particular also called "nas" , in wartime 'bru gtsang mar btsags te measured, , rtsam rgyu'i 'bru chu sing rgyag pa] [IW]

phyag nas - 'thor nas - grains [RY]

syllable, seed, letter, dig, chisel, examine, corn, grain, granule, grain of anything, particle, piece [JV]