Denshi Jisho — Online Japanese dictionary

禁止 きんし prohibition; inhibition; ban
Common word, Noun, Suru verb 
禁止 きんしほう negative statute; law against something
Common word, Noun 
禁止薬物 きんしやくぶつ banned drug
Noun 
禁止条約 きんしじょうやく ban (treaty)
Noun 

You can also

Look up kanji details for 禁止.

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