偏旁的英文：
Chinese character component
the side of a Chinese character
a radical on one side of a character
the right and left part of a character

参考例句：

汉字偏旁名称至少可以追溯到唐初，而现代辞书鲜有提及。
The names of the radicals of Chinese characters can be traced back to at least the early Tang Dynasty.