Hydroid

Hydroid may refer to:

==Biology==

• Hydroid (botany), a type of vascular cell that occurs in certain bryophytes
• Hydroid (zoology), a life stage for most animals of the class Hydrozoa
• Garveia, a genus of cnidarians, including:
• Garveia annulata, the orange hydroid
• Garveia arborea, the orange or hedgehog hydroid