Etymology
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eclair (n.)

"small, oblong cake filled with cream or custard and glazed or iced," 1861, from French éclair, literally "lightning," from Old French esclair "light, daylight, flash of light," verbal noun from esclairare "to light up, illuminate, make shine" (12c.), formerly esclairer, ultimately from Latin exclarare "light up, illumine," from ex "out" (see ex-) + clarus "clear" (see clear (adj.)). Famously defined by The Chambers Dictionary as "a cake, long in shape but short in duration."

updated on November 29, 2020

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Definitions of eclair from WordNet

eclair (n.)
oblong cream puff;
From wordnet.princeton.edu, not affiliated with etymonline.