phlgm - n.
1 the thick viscous substance secreted by the mucous membranes of the respiratory passages, discharged by coughing.
2 a coolness and calmness of disposition. b sluggishness or apathy (supposed to result from too much phlegm in the constitution).
3 archaic phlegm regarded as one of the four bodily humours.

phlegmy adj. [ME & OF fleume f. LL phlegma f. Gk phlegma -atos inflammation f. phlego burn]