Denshi Jisho — Online Japanese dictionary

外側 そとがわ exterior; outside; outer; external; lateral
Common word, Noun, No-adjective 
外側 がいそく exterior; outside; outer; external; lateral
Noun, No-adjective 

You can also

Look up kanji details for 外側.

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