phlegm -
expectorated matter; saliva mixed with discharges from the respiratory passages; in ancient and medieval physiology it was believed to cause sluggishness
mucous secretion,
mucus protective secretion of the mucus membranes; in the gut it lubricates the passage of food and protects the epithelial cells; in the nose and throat and lungs it can make it difficult for bacteria to penetrate the body through the epithelium
phlegm -
apathy demonstrated by an absence of emotional reactions
Phlegm is a viscous liquid secreted by the mucous membranes of mammalians. 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. Phlegm is in essence a water-based gel consisting of glycoproteins, immunoglobulins, lipids and other substances.
OmegaWiki Dictionary
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phlegm A sticky fluid secreted by the mucous membranes of animals.