from The American Heritage® Dictionary of the English Language, 4th Edition
- n. One of the segments forming the body of a radially symmetric animal.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. One of the radial segments making up the body of one of the Cœlenterata.
from the GNU version of the Collaborative International Dictionary of English
- n. One of the radial segments composing the body of one of the Cœlenterata.
from The Century Dictionary and Cyclopedia
- n. One of the radially symmetrical partitions or divisions of a sea-anemone, coral-polyp, or other actinozoan.
Ancient Greek ray + part. (Wiktionary)