Learn how to say Hydroids correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word hydroid:
a coelenterate of an order which includes the hydras. They are distinguished by the dominance of the polyp phase.
Order Hydroida, class Hydrozoa
relating to coelenterates of the hydroid group.
another term for polypoid (sense 1).
mid 19th century: from hydra + -oid