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Etymology · Ancient Greek

ἀκτίς

4 English words descend from Ancient Greek ἀκτίς, most common first.

actinA globular structural protein that polymerizes in a helical fashion to form an actin filament (or microfilament).
actino-ray, ray-shaped
actinostA bone at the base of a paired fin (of a fish)
actinulaA kind of larva of certain hydroids (Tubularia).