Comedo
Pronunciation : Com"e*do
Part of Speech : n.;
Etymology : [L., a glutton. See Comestible.] (Med.)
Definition : Defn: A small nodule or cystic tumor, common on the nose, etc., which on pressure allows the escape of a yellow wormlike mass of retained oily secretion, with a black head (dirt).
pl. Comedones.
Source : Webster's Unabridged Dictionary, 1913