Zoology a member of the Diphyidæ, a family of Hydrozoa, having a pair of swimming-bells opposite each other on the upper part of the stem.
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1884 A. Sedgwick & F. G. Heathcote tr. C. Claus Elem. Text-bk. Zool.: Protozoa to Insecta 250 These groups of individuals may in some diphyids become free and assume a separate existence as Eudoxia.