Radiation for radical: jī.

Radiation of radical is a Chinese character meaning water that rises or splashes when it is impeded, and is found in the Shuowen (说文), Mengzi (孟子), and Sunzi (孙子)-Spotential. Morphological Sound Character. From water, supple. The flow of water is obstructed. 《说文》："激，水碍衺疾波也。" Mengzi -告子上："激动之，可使在山。" If the water flow is blocked, it will be agitated and splashed, so it has the meaning of agitation by derivation.

By extension, it has the meanings of impact, rapidity and intensity.

Moreover, it has the meaning of impact, rapidity, and fierceness, etc.

Jī . And, "said the text": "radical, a said half cover also." Duan Yucai note: "This also has the meaning of obstruction. And by mere, invite the sound meaning is slightly the same." Guifu Yishu: "'a said half cover also', or through as by mere. The word book: by mere, cover also."

When for the "Shuowen" the derivation of the former meaning.

When it is the derivation of the former meaning of "Shuowen", it is also called "jiāo", which is the same as "by mere luck". The rhyme set - Xiao rhyme ": Item," "Shuowen": fortunate. It is also known as "jiāo" (激), which means "fluke" or "mere". Radical, the water is in the way of the vast rapid waves. --Shuowen "radical and line, can be made in the mountains. -- "Mengzi" radical water speed, to the drifting stone, the potential is also. -Sun Tzu, "potential" spring water to stimulate the stone. --Wu Jun, "A Book with Zhu Yuan Si".

Rapidly getting cold. Put the watermelon in cold water to stir it up. To agitate the heart so that something is felt. Stir up and send out. --Tang Liu Zongyuan, "The Collection of Liu Hedong" (柳河东集), to die in righteousness. --Ming Zhang Pu, "Tombstone Records of Five People" (《五人墓碑记》) --To stimulate the indignation of the people. --Qing Xue Fucheng, "Paris Oil Painting".