Etymology
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leaflet (n.)

1787 as a term in botany; 1867 as a term in printing and publication; diminutive of leaf (n.) with -let.

A newspaperman asked the British authorities for a copy of the leaflets distributed in Germany by British airplanes. According to the London Daily Herald, his request was refused with the following answer: "Copies are not given out, as they might fall into enemy hands." [The Living Age magazine, Sept. 1939-Feb. 1940]

updated on August 18, 2020

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Definitions of leaflet from WordNet

leaflet (n.)
a thin triangular flap of a heart valve;
Synonyms: cusp
leaflet (n.)
part of a compound leaf;
leaflet (n.)
a small book usually having a paper cover;
Synonyms: booklet / brochure / folder / pamphlet
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.