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- Dictionaryphlegm/flɛm/
noun
- 1. the thick viscous substance secreted by the mucous membranes of the respiratory passages, especially when produced in excessive quantities during a cold. Similar
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noun
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Phlegm is mucus produced by the respiratory system, excluding that produced by the throat nasal passages. It often refers to respiratory mucus expelled by coughing, otherwise known as sputum. Phlegm, and mucus as a whole, is in essence a water-based gel consisting of glycoproteins, immunoglobulins, lipids and other substances. Its composition varies depending on climate, genetics, and state of the... Wikipedia