hydroid adjective & noun. ['hʌɪdrɔɪd] M19.
[from HYDRA + -OID.]
Zoology.
A. adjective.
1. Designating or pertaining to any coelenterate of the hydrozoan order Hydroida, which has the polyp phase prominent. M19.

2. Of, pertaining to, or belonging to the polypoid phase in the life cycle of hydrozoans. L19.
b. noun. A hydroid individual or colony. M19.

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