Actinal

from WordNet (r) 3.0 (2006)

actinal
    adj 1: (of radiate organisms) located on the surface or end on
           which the mouth is situated [ant: {abactinal}]

from The Collaborative International Dictionary of English v.0.48

Actinal \Ac"ti*nal\, a. [Gr. ?, ?, ray.] (Zool.)
   Pertaining to the part of a radiate animal which contains the
   mouth. --L. Agassiz.
   [1913 Webster]