radial canal

/R EY1 D IY0 AH0 L K AH0 N AE0 L/
noun
  1. 1

    any of the canals extending through the substance of the umbrella from the gastric cavity to the marginal circular canal in jellyfish

  2. 2

    a tube extending outward along each ambulacral area from the circumoral canal in most echinoderms

  3. 3

    any of the numerous minute canals lined with choanocytes which radiate from the paragastric cavity in some sponges and end just below the surface of the sponge