solaninePronunciation: /ˈsɒləniːn/Definition of solanine noun [mass noun] Chemistry a poisonous compound which is present in green potatoes and in related plants. It is a steroid glycoside of the saponin group. Origin: mid 19th century: from French, from the genus name Solanum + -ine4solanine in other Oxford dictionaries Definition of solanine in the US English dictionary