phlegm

Definition / meaning of phlegm

A more than normal amount of thick mucus made by the cells lining the upper airways and lungs. A buildup of phlegm may be caused by infection, irritation, or chronic lung disease, and can cause discomfort in the chest and coughing.

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Find More About 'phlegm'

Source(s):

The Web site of the National Cancer Institute (http://www.cancer.gov/)

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