Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
any of an order (Anostraca) of crustaceans, usually formed in temporary freshwater pools in early spring, having delicate colors and a graceful swimming motion
Used by arrangement with John Wiley & Sons, Inc.
nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Any of various transparent freshwater crustaceans of the order Anostraca that lack a carapace and characteristically swim upside-down.