Hydroid may refer to:
Biology
edit- 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
Business
edit- Hydroid Inc., an autonomous underwater vehicle manufacturer