Definition of "monarch butterfly" []

• A large American butterfly (Danaus plexippus) having light orange-brown wings with black veins and white-spotted black borders, noted for its long-distance migrations and its brightly striped caterpillars that feed on the milkweed plant. Also called milkweed butterfly. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.