grass parakeet grass·pa·ra·keet uncommon noun 1. small Australian parakeet usually light green with black and yellow markings in the wild but bred in many colors Synonymsbudgerigarbudgereegahbudgerygahbudgiegrass parakeetlovebirdshell parakeetMelopsittacus undulatus Related words Broader terms parakeet Parts Melopsittacus WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.