Etymology
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plaque (n.)

1848, "ornamental plate or tablet," from French plaque "metal plate, coin" (15c.), perhaps through Flemish placke "small coin," from Middle Dutch placke "disk, patch, stain," related to German Placken "spot, patch" (compare placard). Meaning "deposit on walls of arteries" is attested by 1891; that of "bacteria deposits on teeth" is by 1898.

updated on July 07, 2020

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Definitions of plaque from WordNet

plaque (n.)
(pathology) a small abnormal patch on or inside the body;
plaque (n.)
a memorial made of brass;
Synonyms: brass / memorial tablet
From wordnet.princeton.edu, not affiliated with etymonline.