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Etymology · Ancient Greek

ἀκτίς, ἀκτῖν-

2 English words descend from Ancient Greek ἀκτίς, ἀκτῖν-, most common first.

actinicRelated to radiation; used most often in reference to light, especially in the ultraviolet range.
actinalPertaining to the side or surface around the mouth in an animal that has radial symmetry such as a starfish.