原子核分裂

げんしかくぶんれつ

noun

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nuclear fission(physics term)

原	meadow, original, primitive, field, plain, prairie, tundra, wilderness
子	child, sign of the rat, 11PM-1AM, first sign of Chinese zodiac
核	nucleus, core, kernel
分	part, minute of time, segment, share, degree, one's lot, duty, understand, know, rate, 1%, chances, shaku/100
裂	split, rend, tear