Recent Examples on the WebTony had a younger sister, Rosa, who was as rosaceous as all girls and women of that name deserve to be. Ian Frazier, The New Yorker, 7 Dec. 2020
Word History
Etymology
in part borrowed from Latin rosāceus "of roses, made of roses" (from rosa rose entry 2 + -āceus -aceous), in part from New Latin Rosaceae, the rose family (from feminine plural of Latin rosāceus) + -ous