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Webster 1913 Edition

Noun.

[

Pyro-

+ Gr. [GREEK] linen.]

(Med.)

A kind of empyreumatic oil produced by the combustion of textures of hemp, linen, or cotton in a copper vessel, – formerly used as a remedial agent.

Dunglison.

pyrothonide ‎(uncountable)

(archaic) A kind of empyreumatic oil produced by the combustion of textures of hemp, linen, or cotton in a copper vessel, formerly used as a remedial agent.