- a finger-shaped cream puff, filled with whipped cream, custard, or pastry cream, often coated with icing.
- a finger-shaped cake of choux pastry, usually filled with cream and covered with chocolate
1861, from French éclair, literally “lightning,” from Old French esclair “light, daylight, flash of light,” from esclairare “to light up, make shine” (12c.), ultimately from Latin exclarare “light up, illumine,” from ex- “out” (see ex-) + clarus “clear” (see clear (adj.)).