Definitions for "Radiata"
An extensive artificial group of invertebrates, having all the parts arranged radially around the vertical axis of the body, and the various organs repeated symmetrically in each ray or spheromere.
Members of the radially symmetrical animal phyla, including cnidarians. radicle An embryonic root of a plant. radioactive dating radius, a spoke of a wheel, hence, a ray] A method of determining the age of fossils and rocks using half-lives of radioactive isotopes.
L. radius, ray, atus, to shine. Corona radiata spreads out in all directions from the internal capsule like the rays of light.