aftereffect

[af-ter-i-fekt, ahf-] /ˈæf tər ɪˌfɛkt, ˈɑf-/
noun
1.
a delayed effect; an effect that follows at some interval after the stimulus that produces it.
2.
Medicine/Medical. a result appearing after the first effect due to an agent, usually a drug, has gone.
Origin
1810-20; after + effect
British Dictionary definitions for aftereffect

aftereffect

/ˈɑːftərɪˌfɛkt/
noun
1.
any result occurring some time after its cause
2.
(med) any delayed response to a stimulus or agent Compare side effect
3.
(psychol) any illusory sensation caused by a stimulus that has ceased