Epinasties is a 10 letter English word. It's valid Scrabble word worth 13 points. It's valid Words with friends word worth 14 points.
You can make 552 anagrams from letters in epinasties (aeeiinpsst).
1875-80; epi- + Greek nast(ós) pressed close + -y3
Young leaves exhibit moreover a pronounced hyponasty or epinasty, which would naturally modify the diurnal curve.