Definition of "wallaby" []

• Any of various marsupials of the genus Wallabia and related genera, of Australia and adjacent islands, related to the kangaroos but generally smaller and often having a colorful coat. (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.

• "A unique antimicrobial has been discovered in wallaby milk that could be used in hospitals to fight deadly antibiotic-resistant bacteria"
• "But the wallaby is a kangaroo, it's just a different size of kangaroo."
• "The wallaby is a smaller kind of kangaroo which is also hunted."