from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any siphonophore which has an air sac for a float.
from the GNU version of the Collaborative International Dictionary of English
- n. Any siphonophore which has an air sac for a float, as the Physalia.
from The Century Dictionary and Cyclopedia
- Moving by means of a vesicular float or buoy; of or pertaining to the Physograda.
- n. A member of the Physograda.
Ancient Greek a bellows + Latin gradi to walk, go. (Wiktionary)