Englishfor English speakers
Langmuir
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noun
United States chemist who studied surface chemistry and developed the gas-filled tungsten lamp and worked on high temperature electrical discharges (1881-1957)
cavity
Noun
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A cavity is a hole or hollow area.
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A cavity is a hollow area inside the body (like the sinuses).
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A cavity is a hole in a decayed tooth.
You have a cavity in your back teeth.