from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A branch of physics that deals with light or the study of light and its effects.
- n. That science concerned with the production of light and energy, especially regarding therapeutic applications.
from the GNU version of the Collaborative International Dictionary of English
- n. The doctrine or science of light, explaining its nature and phenomena; optics.
from The Century Dictionary and Cyclopedia
- n. The science of light.
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