Ray of Natural Light
This page is the CodyCross answer for the clue below from Science Lab, Group 318, Puzzle 4 (Volumetric Flask).
Question is: Ray of Natural Light
and the answer is: SUNBEAM
Word Meaning:
SUNBEAM — A ray of sunlight; especially, a visible, narrow, and intense (relative to ambient light) ray of sunlight (as revealed by, for example, its diffraction among dust particles).
Definitions from Wiktionary.