About 斤 and 筋.
My dictionary says that 斤 and 筋 have the same variant form: 觔.
If it is true, I'd like to know how much 觔 is used for the meaning 斤 "half a kilo" and how much for 筋 "tendon".
Thank you!

Question

Answer

觔 is only for 斤, not for 筋

Answer

斤：a   unit  of  weight.    1斤=0.5  kilogram.
but  筋  is  not  a  unit  of   weight.  筋 have  many  meaning  1.(spoken  language)  tendon, sinew
扭了筋：get  one's  sinew  (tendon)  sprained.  2(spoken  language)  veins that  stand  out  under  the  skin  她的手臂上露着青筋  ：the  veins  stand  out  on  the  back  of  her hands.3.  anything  resembling  a  tendon  or  vein.  钢筋： reinforcing  steel.   steel  reinforcement.  橡皮筋： rubber band.

Answer

依字典 觔有以下構詞

1.  半空裡翻觔斗 ㄅㄢˋ　ㄎㄨㄥ　ㄌ｜ˇ　ㄈㄢ　ㄐ｜ㄣ　ㄉㄡˇ 
2.  彈觔估兩 ㄊㄢˊ　ㄐ｜ㄣ　ㄍㄨ　ㄌ｜ㄤˇ 
3.  牛表牛觔 ㄋ｜ㄡˊ　ㄅ｜ㄠˇ　ㄋ｜ㄡˊ　ㄐ｜ㄣ 
4.  觔 ㄐ｜ㄣ 
5.  觔斗 ㄐ｜ㄣ　ㄉㄡˇ 
6.  觔斗雲 ㄐ｜ㄣ　ㄉㄡˇ　ㄩㄣˊ 
7.  觔力 ㄐ｜ㄣ　ㄌ｜ˋ 
8.  觔兩 ㄐ｜ㄣ　ㄌ｜ㄤˇ 
9.  觔節 ㄐ｜ㄣ　ㄐ｜ㄝˊ 
10.  筋觔 ㄐ｜ㄣ　ㄐ｜ㄣ 
11.  栽觔斗 ㄗㄞ　ㄐ｜ㄣ　ㄉㄡˇ

其中 2. 8. 是  "斤" 之意 但現今罕用
3. 7. 9. 10. 是 "筋" 之意 也罕用
而其餘 1. 5. 6. 11. 遂成專用 
然而也可見以"筋"代替 (即 觔斗 = 筋斗)

"觔" 作 "斤" 用 的錯誤
這裡已經解說得很清楚了
http://www.zdic.net/z/24/kx/89D4.htm
是讀書人以訛傳訛的結果

"斤" 在中國 是指 市斤 即 500 公克 "half a kilo"
但在台灣則是指  台斤 即 600 公克
見  http://zh.wikipedia.org/zh-tw/%E6%96%A4

Answer

觔 这个字平时不用的
筋不是计量单位

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