(uncountable) A mixture consisting of egg white and a sweetener, variously mixed with (in western Europe) almonds or (in eastern Europe) hazelnuts or (in US) used without nuts as a filler in candy bars.
(countable) A piece of this mixture, typically eaten as a confection.
From French nougat, from Occitan nogat, from noga (“nut”), ultimately from Latin nux (“nut”) + -atus (“-ate, forming adjectives and substantives having or resembling some thing or trait”). Compare Spanish nuégado.