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[kanji]
[terminology]
Bushu
The bushu (部首) or "radical" of a kanji is its classification by means of one of 216 component parts of the kanji.
The system of classifying the kanji by their component parts first began with the Kang-xi dictionary class="jr">kōki jiten (康煕字典) in China.
See also
Kanji radical names for a complete list.
Links
Unicode CJK radicals supplement (PDF format)
Unicode Kangxi radicals
Hanzi 214 KangXi Radicals from Sapienti. Contains examples.