/ sɜːdʒ; NAmE sɜːrdʒ/ noun
[ U ] a type of strong cloth made of wool, used for making clothes :
a blue serge suit
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WORD ORIGIN
late Middle English : from Old French sarge , from a variant of Latin serica (lana) silken (wool), from sericus , based on Greek Sēres , the name given to the inhabitants of the Far Eastern countries from which silk first came overland to Europe.