As an adjective midroll is
(photography|film) in the middle of a roll of film.
As a noun midroll is
(advertising) a spot ad in the middle of an online video it is often 15 or 30 seconds long.
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Not English
Wikidiffcom has no English definition. It may be misspelled. midroll
English
Adjective
(-)
(photography, film) In the middle of a roll of film.
Noun
(
en noun)
(advertising) A spot ad in the middle of an online video. It is often 15 or 30 seconds long.