Definition of firebird:
(n) :
(Slavic mythology) A magical and prophetic glowing or burning bird from a faraway land, which is both a blessing and a harbinger of doom to its captor
(n) :
A scarlet tanager (Piranga olivacea). (This species is now classified as belonging to the cardinal family: Cardinalidae)
(n) :
A Baltimore oriole (Icterus galbula).
(n) :
A vermilion flycatcher (Pyrocephalus rubinus).