Definition of after-glow:
(adv) :
Behind; later in time; following.
(adj) :
(dated) Later; second (of two); next, following, subsequent
(adj) :
(nautical or aeronautical, where the frame of reference is within the craft) At or towards the stern of a ship or the rear of an aircraft.
(n) :
Of before-and-after images: the one that shows the difference after a specified treatment.