a coarse fabric of silk mixed with wool or mohair and often stiffened with gum
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Webster's Dictionary (GCIDE)
Grogram \Grog"ram\, Grogran \Grog"ran\, n. [OF. gros-grain, lit., gros-grain, of a coarse texture. See Gross, and Grain a kernel, and cf. Grog.] A coarse stuff made of silk and mohair, or of coarse silk. [1913 Webster]