Meaning

adjective of or pertaining to or characteristic of plants of the family Rosaceae

adjective of something having a dusty purplish pink color

originEtymology tree Translingual rosacea Proto-Indo-European *h₃ed- Proto-Indo-European *-os Proto-Indo-European *h₃édosder.? Proto-Italic *-ōtsos or *-otsos Latin -ōsus Old French -usbor. Middle English -ous English -ous English rosaceous From Translingual rosacea + English -ous.

Etymology from Wiktionary, CC BY-SA 3.0