偏旁 [ㄆㄧㄢ ㄆㄤˊ; pian1 pang2]
  the left- and right-side of a split Chinese character, often the key (radical) and phonetic
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  偏旁
  扁旁
  へんぼう
  noun (common) (futsuumeishi)
  left and right kanji radicals
  colloquialism
  [now used for 冠, 脚, etc. as well]
  kanji radical positions
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