é·clair 
(ā-klâr, āklâr′) or e·clair (ē-klâr, ā-klâr, ə-klâr)
(ā-klâr, āklâr′) or e·clair (ē-klâr, ā-klâr, ə-klâr)n.
An elongated pastry filled with custard or whipped cream and usually iced with chocolate.
[French, from Old French esclair, lightning, from esclairier, to light up, from Vulgar Latin *exclāriāre, from Latin exclārāre : ex-, intensive pref.; see EX- + clārus, clear; see kelə-2 in the Appendix of Indo-European roots.]