Wordnet 3.0
NOUN (1)
1.
a small inflamed elevation of skin containing pus;
a blister filled with pus;
The Collaborative International Dictionary of English v.0.48:
Pustule \Pus"tule\ (?; 135), n. [L. pustula, and pusula: cf. F.
pustule.] (Med.)
A vesicle or an elevation of the cuticle with an inflamed
base, containing pus.
[1913 Webster]
Malignant pustule. See under Malignant.
[1913 Webster]
WordNet (r) 3.0 (2006):
pustule
n 1: a small inflamed elevation of skin containing pus; a
blister filled with pus