- hydrocircus
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n. [Gr. hydor, water; kirkos, circle](ECHINODERMATA)The hydrocoelic ring surrounding the mouth.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.