explainer

noun
ex·plain·er | \ ik-ˈsplā-nər \
plural explainers

Definition of explainer 

: a person or thing that explains something: such as

a : a person who makes something understandable Modern day presidents must be good explainers of a complex world … —Jonathan Alter et al.

b : an article, podcast, graphic, etc., that explains something complex or not widely understood : an in-depth treatment of a topic Each half-hour episode contained a big explainer of a complicated issue. The list of topics sounds like the arcane scraps from the cutting-room floor of most newsrooms—the amount of hidden sugar in food, civil forfeiture, the false hopes of lotteries, the failure of the American government to safeguard people who served as interpreters in Iraq and Afghanistan. —David Carr Inside, the issue contains a long explainer piece on how the subprime mess came to be and how it wreaked havoc on Citi, Wall Street and especially Merrill. —Yvette Kantrow

First Known Use of explainer

1579, in the meaning defined above

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The first known use of explainer was in 1579

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