Portuguese man-of-war Hear it!

Portuguese man-of-war definition

Portuguese man-of-war

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

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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