oropendola noun1 •Any of a number of tropical birds related to the caciques, mostly in the genus Psarocolius, and, like the caciques, noted for living communally in large, hanging basket nests.Orioles, along with grackles, blackbirds, meadowlarks, and oropendolas, belong to a family called the Icteridae, which are found only in the New World. — 1988 formsoropendolas