Actinon



a chemically inert, gaseous, short-lived isotope of radon that is a member of the . Symbol: An; atomic number: 86; atomic weight: 219.
noun
a radioisotope of radon that is a decay product of radium. Symbol: An or 219Rn; atomic no: 86; half-life: 3.92s
another name for actinide

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  • Actinopod

    any protozoan of the subclass Actinopoda, including the heliozoans and radiolarians, having stiff, rodlike, radiating pseudopodia. noun any protozoan of the phylum Actinopoda, such as a radiolarian or a heliozoan, having stiff radiating cytoplasmic projections

  • Actinopods

    any protozoan of the subclass Actinopoda, including the heliozoans and radiolarians, having stiff, rodlike, radiating pseudopodia. noun any protozoan of the phylum Actinopoda, such as a radiolarian or a heliozoan, having stiff radiating cytoplasmic projections



  • Actinopterygian

    belonging or pertaining to the Actinopterygii, a group of bony fishes. an actinopterygian fish. Historical Examples Major adaptive levels in the evolution of the actinopterygian feeding mechanism. A New Genus of Pennsylvania Fish (Crossoperygii, Coelacanthiformes) from Kansas Joan Echols actinopterygian (āk’tə-nŏp’tə-rĭj’ē-ən) See ray-finned fish.

  • Actinotherapy

    radiotherapy, especially using ultraviolet rays. noun a former name for radiotherapy actinotherapy ac·ti·no·ther·a·py (āk’tə-nō-thěr’ə-pē) n. The therapeutic use of ultraviolet light.



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