| actino-, actin-, actini-, -actinal, actis- (Greek: ray [as of light], radiance, radiating or tentacled structure).actinal: The region from which the rays or tentacles grow on a radiate animal.
 actiniform: Having a radial form; rayed.
 actinobiology: The study of the effects of radiation on living organisms.
 actinocutitis: Radio dermatitis (skin inflammation).
 actinodermatitis: Inflammation of the skin as a result of exposure to sunlight or because of adverse reaction to radiation-skin therapy.
 actinohematin: A red respiratory pigment found in certain forms of Actina (sea anemones).
 actinology: 1. The science of photochemistry or the science of the chemical effects of light.  2. The study of radiant energy. actinometer: An instrument for measuring the intensity and penetrating power of actinic rays. Also actinometry.
 actinomorphic: Having radial symmetry, as a flower or a starfish.
 actinomorphy: Radial symmetry in flowers.
 actinotherapy: The treatment of a disease with ultraviolet or actinic rays.
 actinotoxin: A crude poison derived from alcoholic extracts of the tentacles of sea anemones.
 actinozoan: Saltwater animals, such as corals, sea anemones, sea fans, etc.
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