Denshi Jisho — Online Japanese dictionary

増す ます to increase; to grow
Common word, Godan verb with su ending, Intransitive verb, Transitive verb 
増す増す ますます increasingly; more and more; decreasingly; less and less
Adverb, Usually written using kana alone 

You can also

Look up kanji details for 増す.

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