Hydrozoa definitions and example sentences on Wordnik

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Definitions (2)

The AcalephÃ¦; one of the classes of cÅ“lenterates, including the Hydroidea, Discophora, and Siphonophora.

coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes

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. — Thomas Henry Huxley; A Sketch Of His Life And Work
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 Gawd, what a costume!" — The Ship Who Sang