Definition of "hydroids" []

• Plural form of hydroid. (noun)

Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License

• "Once I got in close to the sponges and hydroids on the bottom, I saw sea horses and decorator crabs like bits of sponge with claws on."
• "The particles are surfaces for the attachment of diatoms and hydroids."
• "There are over 500 species of fish, 65 scleraetinian corals, 45 hydroids and 350 molluscs in the area, plus a great diversity of sponges, marine worms and crustaceans."