¹ Source: wiktionary.com
Medical Definition of Phorbol
1. The parent alcohol of the cocarcinogens, which are 12,13(9,9a) diesters of phorbol found in croton oil; the hydrocarbon skeleton is a cyclopropa-benzazulene; phorbol esters mimic 1,2-diacylglycerol as activators of protein kinase C. (05 Mar 2000)