perradial

from The Century Dictionary.

• Primarily or fundamentally radial; pertaining to the original or primary rays of a hydrozoan: said of certain parts or processes, as tentacles, as distinguished from those which are secondary and tertiary, or interradial and adradial: as, the perradial marginal bodies of a hydrozoan.

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

• adjective (Zoöl.) Situated around the radii, or radial tubes, of a radiate.

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

• adjective zoology Situated around the radii, or radial tubes, of a radiate.