Englishfor English speakers
ytterbium
Noun
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Ytterbium is a metallic element with an atomic number of 70 and symbol Yb.
glass
Noun
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Glass is a transparent solid and is usually clear. Windows and eyeglasses are made from it, as well as drinking glasses.
Through the window glass I could see the trees bend in the wind, but I was warm indoors.
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A glass is a drinking cup with no handle.
As soon as I finished drinking, he filled up my glass again.
laser
Noun
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A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.
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The term laser originated as an acronym for "light amplification by stimulated emission of radiation".