sphere, optical, invisible Example Sentence:

The key development lies in the ability of the sphere, an optical device, not only to remain invisible itself but to slow light.

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Related: sphere, optical, invisible

Prev: MINT, often used in the phrase the MINT countries, is an acronym1 of Mexico, Indonesia, Nigeria and Turkey, and is used in financial spheres to characterize these countries as an economic group with growing influence.

Next: They signed an agreement that parcelled out the Middle East into several spheres of influence.