medusa (mĭ-d 'sə) Pronunciation Key
Plural medusas or medusae (mĭ-d 'sē)
A cnidarian in its free-swimming stage. Medusas are bell-shaped, with tentacles hanging down around a central mouth. Jellyfish are medusas, while corals and sea anemones lack a medusa stage and exist only as polyps. Compare polyp. |