Denshi Jisho — Online Japanese dictionary

掲示板 けいじばん bulletin board; display board; notice board; electronic bulletin board; BBS
Common word, Noun 
掲示板システム けいじばんシステム bulletin board system; BBS
Noun 

You can also

Look up kanji details for 掲示板.

Try a Yahoo Jisho search for 掲示板 .
Try a Goo Jisho search for 掲示板 .
Try a Google search for 掲示板 .