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Webster 1913 Edition

(?; 135)

Adj.

[L.

pustulans

, p. pr. See

Verb.

]

(Med.)

Producing pustules.

–

Noun.

A medicine that produces pustules, as croton oil.

pustulant ‎(comparative more pustulant, superlative most pustulant)

pustulant ‎(plural pustulants)

(medicine) Any medicine that produces pustules.
Croton oil is a pustulant.