Phlegm
Phlegm (pronounced /flɛm/) is a sticky fluid secreted by the mucus membranes of humans and other animals. Its definition is limited to the mucus produced by the respiratory system, excluding that from the nasal passages, and particularly that which is expelled by coughing (sputum). Its composition varies, depending on climate, genetics, and state of the immune system, but basically is a water-based gel consisting of glycoproteins, immunoglobulins, lipids, etc.
In ancient (and now entirely discredited) Hippocratic medicine phlegm was counted as one of the four bodily humors possessing the properties of coldness and wetness and was responsible for apathetic and sluggish behavior. This old belief is preserved in the word phlegmatic.
See also [ Saliva ]
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