amygdalinPronunciation: /əˈmɪgd(ə)lɪn/Definition of amygdalin noun [mass noun] Chemistry a bitter crystalline compound found in bitter almonds and the stones of peaches, apricots, and other fruit. Origin: mid 19th century: from Latin amygdala 'almond' + -in1amygdalin in other Oxford dictionaries Definition of amygdalin in the US English dictionary