ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷ ̷ ̷ noun
Etymology: after (IV) + image; translation of German nachbild
: a usually visual sensation occurring after the external stimulus causing it has ceased to operate — see complementary afterimage , hering image , hess image , negative afterimage , positive afterimage , purkinje afterimage