1a scene in a film, novel, etc. set in a time earlier than the main story:in a series of flashbacks, we follow the pair through their teenage years [mass noun]:the movie tells the story in flashback
a disturbing sudden vivid memory of an event in the past, typically as the result of psychological trauma or taking LSD.
2a flame moving rapidly back through a combustible vapour:cooling the area prevented a flashback
flashback in other Oxford dictionaries
Definition of flashback in the US English dictionary
