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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.
This species' caterpillar has some tricks up its sleeve: It can resemble bird droppings but can also look like a tiny snake at a later stage of development. The monarch butterfly chrysalis has what appear to be gold dots and threads, which help the developing insect blend in with leaves.