The Collaborative International Dictionary
Diachylon \Di*ach"y*lon\, ||Diachylum \Di*ach"y*lum\, n. [NL. diachylum, fr. Gr. ? very juicy; dia` thoroughly + ? juice.] (Med. & Chem.) A plaster originally composed of the juices of several plants (whence its name), but now made of an oxide of lead and oil, and consisting essentially of glycerin mixed with lead salts of the fat acids.
Wiktionary
n. (context medicine archaic English) 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.
Usage examples of "diachylum".
There were two of my men wounded as well as myself, but not severely, which was fortunate, as we had no surgeon on board, and only about half a yard of diachylum plaster in the vessel.