/ ˈfʌstiən; NAmE -tʃən/ noun [ U ]
1.
a thick strong cotton cloth with a slightly rough surface, used in the past for making clothes
2.
( literary ) language that sounds impressive but does not mean much
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WORD ORIGIN
Middle English : from Old French fustaigne , from medieval Latin fustaneum , from (pannus) fustaneus cloth from Fostat , a suburb of Cairo; sense 2 perhaps from the fact that fustian was sometimes used to cover pillows and cushions, implying that the language was “padded”; compare with bombast .