|sci.lang.japan FAQ / 1. Writing / 1.2. Kanji|
Kanji "radicals" [bushu (部首)] are a way of classifying characters for searching. Radicals are found in all kanji dictionaries, and taught in Japanese schools (see 1.3.5. How is Japanese writing taught to Japanese children? for more on Japanese schools). A "radical" is part of the kanji which is found in more than one character. For example, 汁 [soup; juice], 汚 [dirty], 泡 [bubble], and 泳 [swim] all have the same three-stroke element with the meaning "water" on the left.
There are 214 different radicals. The radical system was invented for a Chinese dictionary, the Kangxi dictionary [Kōki Jiten (康煕字典)], published in 1716.
To search, one first identifies the radical. It is usually either the left [Hen (偏)] or upper [Kanmuri (冠)] part of the character, or a surrounding part which is wrapped around the character [Kamae (構え)].
Kanji dictionaries usually have a list of the radicals on their inside covers, ordered by increasing stroke count, together with the page number of the radical's heading. Under each radical, the kanji are ordered by increasing number of strokes. The usual order of the radicals is shown in 220.127.116.11. What are the names of the kanji radicals? See also 1.2.11. How is a kanji dictionary used?
The number of kanji which correspond to a particular radical varies quite a lot. Some radicals have hundreds of corresponding kanji, and some have only a handful.
Part of kanji tests such as the Kanji Kentei (see 10.2. Kanji Kentei) is testing the ability to identify kanji radicals and their names.
The sci.lang.japan FAQ also offers a lookup system via radicals.
About the kanji links: You can choose where the kanji links on this page go to at kanji.sljfaq.org.
The image from the Kangxi dictionary is courtesy of www.KangXiZiDian.com.
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