Definition of "hydrozoa" []

• A large group of marine animals, of the class Hydrozoa, whose life cycles contain a sexual and asexual stage (noun)

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• "It seems there's a species of hydrozoa that can pretty much live forever."
• "During this period he was gradually passing from his first anatomical love, the structure of the Invertebrates, to Vertebrate work, and although he continued to take a deep interest in the course of the progress of research in that group of animals, the publication of his great work on oceanic hydrozoa by the Ray Society was the last piece of important work he wrote upon any anatomical subject apart from vertebrates."
• "The Corviki resemble a marine animal in the class hydrozoa, sort of a large sac-like body with a complex collection of tendrils that may be nerve endings. ""