从以下词典查找:
历史:
háo
I
1   fine long hair
2   writing brush
3   one of the two or three loops on a steelyard for hanging from the user's hand:
 头(二)毫 first (second) loop
II [in the negative] in the least; at all 毫不 毫无
III
1   milli- 毫米 
2   (also 毫子 〈旧〉) hao (a traditional unit of length, equal to 0. 0001 chi (市尺), and equivalent to 0. 0333 milimetre or 0. 0013 inch)
3   hao (a traditional unit of weight, equal to 0. 00001 jin (市斤), and equivalent to 5 milligrams or 0. 075 grain)
4   〈方〉 = 2 jiăo

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