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Webster 1913 Edition

Noun.

[L.

purgamentum

offscourings, washings, expiatory sacrifice. See

That which is excreted; excretion.

[Obs.]

(Med.)

A cathartic; a purgative.

[Obs.]

Bacon.

Noun.

[L. purgamen.] A cathartic.

purgament ‎(plural purgaments)

(obsolete) That which is excreted or purged; excretion.
(obsolete) A cathartic; a purgative.
(Can we find and add a quotation of Francis Bacon to this entry?)