Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
any of a genus (Physalia) of large, colonial, warm-sea siphonophores having a large, bladderlike sac, with a sail-like structure on top, which enables them to float on the water, and long, dangling tentacles that have powerful stinging cells
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.
A complex colonial siphonophore of the genus Physalia, of warm seas, having a bluish bladderlike float with a broad saillike crest from which hang numerous long stinging tentacles.