What is meaning, origin and usage of word ‘Éclair’?

Meaning: This noun is a long thin cake made of very light pastry. which is filled with cream and usually has chocolate on top.

Origin: The word comes from the French éclair, meaning "flash of lightning", so named because it is eaten quickly (in a flash). However, some believe that the name is due to the glistening of the frosting resembling lightning.

Usage: She finished her eclair and laid down her fork.

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