Denshi Jisho — Online Japanese dictionary

きん 1: (Archaism) unit of weight ~600g;
2: (Archaism) pound (unit of mass: 453.6g);
3: loaf (of bread)
Noun 
きんめ weight
Noun 
きんりょう weight
Common word, Noun 

You can also

Look up kanji details for 斤.

Try a Yahoo Jisho search for 斤 .
Try a Goo Jisho search for 斤 .
Try a Google search for 斤 .