\Ro*sa"ceous\, a. [L. rosaceus, fr. rosa rose.]
1. (Bot.)
   (a) Of or pertaining to a natural order of plants
       ({Rosace[ae]}) of which the rose is the type. It
       includes also the plums and cherries, meadowsweet,
       brambles, the strawberry, the hawthorn, applies,
       pears, service trees, and quinces.
   (b) Like a rose in shape or appearance; as, a rosaceous
       corolla.
2. Of a pure purpish pink color.