Denshi Jisho — Online Japanese dictionary

父上 ちちうえ father (esp. used in samurai families prior to the Meiji period)
Noun, Polite language 

You can also

Look up kanji details for 父上.

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