diachylum

Noun

diachylon (countable and uncountable, plural diachylons or diachyla)

1. A plaster originally composed of the juices of several plants, later made of an oxide of lead and oil, and consisting essentially of glycerine mixed with lead salts of the fat acids.
   • Externally, I find the practitioners on whom I have chiefly relied used the plasters of Paracelsus, of melilot, diachylon, and probably diaphoenicon, all well known to the old pharmacopoeias, and some of them to the modern ones,—to say nothing of "my yellow salve," of Governor John, the second, for...1832, Oliver Wendell Holmes, Sr. (The Physician and Poet not the Jurist), The Complete PG Works of Oliver Wendell Holmes, Sr.