hydromedusa

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A hydrozoan in the medusoid stage of its life cycle.

from The Century Dictionary.

• noun Same as hydromedusan.
• noun [capitalized] A genus of reptiles.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Zoöl.) Any medusa or jellyfish which is produced by budding from a hydroid. They are called also Craspedota, and naked-eyed medusæ.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The South American snake-necked turtle.