- 1. n. pl. The group of hydroids to which the fresh-water hydras belong. Source: opted
- 2. The group of hydroids to which the fresh-water hydras belong. Source: webster
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hydrina
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hydriahydriadhydrichydridehydrideshydriformhydrillaHydrilla verticillatahydriodatehydriodichydriodic acidhydriodide