marginate BiologyDefinition of marginate verb Pronunciation: /ˈmɑːdʒɪneɪt/ [with object] provide with a margin or border; form a border to: the nuclear chromatin is marginated at the nuclear membrane adjective Pronunciation: /ˈmɑːdʒɪnət/ having a distinct margin or border. Derivatives marginationPronunciation: /-ˈneɪʃ(ə)n/ noun marginate in other Oxford dictionaries Definition of marginate in the US English dictionary