means A thorny flowering shrub of the genus Rosa, prized for its fragrant, many-petalled blooms — or the deep pinkish-red color named after them.

from From Latin 'rosa', which traveled into Old English and stayed put as 'rose'. The Latin word itself may be a cousin of Greek 'rhodon' (rose), and both are often traced to an older Eastern source — possibly Iranian — though the trail grows faint that far back. The color sense bloomed later, the flower simply lending its name to its own shade.