grackle /ˈɡɹækl̩/ noun2 •Any of several passerine birds of the genera Quiscalus, Hypopyrrhus, Lampropsar and Macroagelaius, of the Americas, having iridescent plumage.Outside, a gang of grackles combed the landscaped lawn like a homicide squad dragging a field for evidence. — 1995 •Any of several Asian myna birds of the genus Gracula. formsgrackles