Definition of "siphonophore" []

• Any of various transparent, often subtly colored marine hydrozoans of the order Siphonophora, consisting of a floating or swimming colony of polyplike and medusalike individuals and including the Portuguese man-of-war. (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.

• "Many think of it as a jellyfish, but in fact it is a siphonophore—a colony of minute individuals."
• "This Portuguese man-of-war is a type of siphonophore often found in tropical waters."
• "The manefish is thought to feed on, or take food from, a siphonophore, which resembles a jellyfish, and which has tentacles that could damage the fish."