Source : Webster's Revised Unabridged Dictionary (1913)

Rosella \Ro"sel"la\, n. [NL., dim. of L. rosa rose.] (Zo["o]l.)
   A beautiful Australian parrakeet ({Platycercus eximius})
   often kept as a cage bird. The head and back of the neck are
   scarlet, the throat is white, the back dark green varied with
   lighter green, and the breast yellow.