Definition of: diachylon

(dī·ak′ə·lon) noun Med.
1. A plaster formed by combining lead oxide, olive oil, and water; lead or litharge plaster.
2. A mixture of mucilaginous vegetable juices, gums, etc., formerly used in making plasters and salves. Also diachylon plaster, di·ach′·y·lum (-ə·ləm). [<Med. L diachylum <L diachylon <Gk. dia chylōn made of juices; orig. referring to an ointment made of vegetable juices]