Denshi Jisho — Online Japanese dictionary

手のひら てのひら the palm (of one's hand)
Common word, Noun 
手のひらを返す てのひらをかえす 1: to change one's attitude quickly;
2: to flip over one's hand
Expression, Godan verb with su ending 

You can also

Look up kanji details for 手のひら.

Try a Yahoo Jisho search for 手のひら .
Try a Goo Jisho search for 手のひら .
Try a Google search for 手のひら .