principle in Wingdings is ◻︎❒︎♓︎■︎♍︎♓︎◻︎●︎♏︎

Any original inherent constituent which characterizes asubstance, or gives it its essential properties, and which canusually be separated by analysis; -- applied especially to drugs,plant extracts, etc.Cathartine is the bitter, purgative principle of senna. Gregory.Bitter principle, Principle of contradiction, etc. See under Bitter,Contradiction, etc.