Main Entry: phlegm

Pronunciation: \ˈflem\

Function: noun

Etymology: Middle English fleume, from Anglo-French, from Late Latin phlegmat-, phlegma, from Greek, flame, inflammation, phlegm, from phlegein to burn — more at black

Date: 13th century

1 : the one of the four humors in early physiology that was considered to be cold and moist and to cause sluggishness
2 : viscid mucus secreted in abnormal quantity in the respiratory passages
3 a : dull or apathetic coldness or indifference b : intrepid coolness or calm fortitude

— phlegmy \ˈfle-mē\ adjective