Definition of rosella:
(n) :
A parrot belonging to any of the five to eight species in the genus Platycercus (originally specifically Platycercus eximius) which is native to Australia and nearby islands.
(n) :
Alternative form of roselle (Hibiscus sabdariffa) [Hibiscus sabdariffa, an edible flower in the hibiscus family used to make hibiscus tea.]