meaning of hydroid
1.  Related to, or resembling, the hydra; of or pertaining to the Hydroidea. 
2.  One of the Hydroideas. 
3.  colonial coelenterates having the polyp phase dominant
						 
1.  Related to, or resembling, the hydra; of or pertaining to the Hydroidea. 
2.  One of the Hydroideas. 
3.  colonial coelenterates having the polyp phase dominant