ˈhärtˌsēz, ˈhȧt- noun
Etymology: Middle English herts ese, from herts (gen. of hert heart) + ese ease
1. : peace of mind : tranquillity
religion failed to bring him heartsease — R.H.Bainton
2.
a. : any of various violas: as
(1) : wild pansy
(2) : a common Old World viola ( Viola arvensis ) with creamy often violet-tinged flowers
(3) : a violet ( V. ocellata ) of the Pacific coast of No. America with white petals tinged or marked with yellow and deep violet
b. : any of several smartweeds
3. : a strong violet that is redder and paler than pansy or clematis and redder and lighter than royal purple (sense 2)