- like a hydra or polyp
- of or related to an order (Hydroida) of hydrozoans, including the hydras and many colonial marine species
Origin of hydroidhydr(a) + -oid
any hydroid hydrozoan
- Any of numerous solitary or colonial hydrozoans having a polyp rather than a medusa as the dominant stage of the life cycle.
- The asexual polyp in the life cycle of a hydrozoan.
Origin of hydroidhydr(a) -oid
(comparative more hydroid, superlative most hydroid)
- Of or pertaining to such creatures