Definition of optical activity in English:

optical activity

Syllabification: op·ti·cal ac·tiv·i·ty

noun

Chemistry
The property (displayed by solutions of some compounds, notably many sugars) of rotating the plane of polarization of plane-polarized light.
More example sentences
  • These materials are said to display optical activity, and are rapidly gaining popularity among engineers.
  • If the product and catalyst of a reaction were the same, then amplification of optical activity might just be possible, they reasoned.
  • In the slightly different situation of a crystal with optical activity, the center of the bull's-eye is not black, and its color gives information about the amount of twist.

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Word of the day anomalous
Pronunciation: əˈnɒm(ə)ləs
adjective
deviating from what is standard, normal, or expected