Aktis
Aktis is a Greek noun meaning a ray or beam of light. In modern Greek, the word is used in everyday language to refer to a light ray, sunbeam, or any narrow shaft of light. The term has also entered scientific English as a root from the Greek idea of rays.
Etymology and linguistic use: Aktis derives from ancient Greek ακτίς (aktís), with related forms such as ακτίν (aktín)
Examples in science: In biology and zoology, actin- (from the same Greek root) appears in actin filaments,
Modern usage: The concept of aktis remains an etymological foundation for many scientific terms describing rays,