Etymology
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blackbird (n.)

late 15c. (late 13c. as a surname), from black (adj.) + bird (n.1). Originally in reference to a large species of European thrush, the male of which is wholly black; applied in the New World to other similar birds. OED says so called for being the only "black" (really dark brown) bird among the songbirds, reflecting an older sense of bird that did not include rooks, crows, or ravens.

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Definitions of blackbird

blackbird (n.)
any bird of the family Icteridae whose male is black or predominantly black;
Synonyms: New World blackbird
blackbird (n.)
common black European thrush;
Synonyms: merl / merle / ouzel / ousel / European blackbird / Turdus merula
From wordnet.princeton.edu