Etymology
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mercer (n.)

"dealer in small wares or merchandise of any sort," also, specifically, "dealer in textiles or clothes of any sort, especially silk," c. 1200 (late 12c. as a surname), from Old French mercier "shopkeeper, tradesman," from Vulgar Latin *merciarius, from Latin merx "wares, merchandise" (see market (n.)). Related: Mercery.

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Definitions of mercer
1
mercer (n.)
a dealer in textiles (especially silks);
2
Mercer (n.)
British maker of printed calico cloth who invented mercerizing (1791-1866);
Synonyms: John Mercer
From wordnet.princeton.edu