any protozoan of the subclass Actinopoda, including the heliozoans and radiolarians, having stiff, rodlike, radiating pseudopodia.
any protozoan of the phylum Actinopoda, such as a radiolarian or a heliozoan, having stiff radiating cytoplasmic projections
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.
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.
. noun the isotope of uranium that has a mass number of 235
. noun, adjective another word for anthozoan