belonging or pertaining to the Actinopterygii, a group of bony fishes.
an actinopterygian fish.
Major adaptive levels in the evolution of the actinopterygian feeding mechanism.
A New Genus of Pennsylvania Fish (Crossoperygii, Coelacanthiformes) from Kansas Joan Echols
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
the process or state of acting or of being active: The machine is not in action now. something done or performed; act; deed. an act that one consciously wills and that may be characterized by physical or mental activity: a crisis that demands action instead of debate; hoping for constructive action by the landlord. actions, […]
- Action at a distance
noun (physics) the supposed interaction of two separated bodies without any intervening medium. In modern theories all interactions are assumed to require a field of force