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Freebase (0.00 / 0 votes) Rate this definition: Monarch butterfly. The Monarch butterfly is a milkweed butterfly in the family Nymphalidae. It is perhaps the best known of all North American butterflies. Since the 19th century, it has been found in New Zealand, and in Australia since 1871, where it is called the wanderer.
Monarch butterflies are bright orange with black and white markings. The body of the monarch is black. The head has a set of antennae. The wings are mostly orange with black veins running throughout. The outer edge of the wings has a thick black border. Within the black border are white spots.