a. [f. Gr. ἀκτῖν- ray + -FORM.] Having a radiated form; of the form of a sea-anemone, as the coralline polypes.
1843. Owen, Anat. Inv. Anim., 87. Many of the large actiniform polypes of the tropical seas combine with a structure which is essentially similar to our sea-anemonies, an internal calcareous axis or skeleton.
1855. Knight, Eng. Cycl., III. 587. Madrepora, Animals actiniform, rather short, with twelve simple tentacula.
