Etymology
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dace (n.)

type of small European freshwater fish, mid-15c., also dars, dase, dare, from Old French darz"a dace," nominative or plural of dart "dart" (see dart (n.)). So called for its swiftness. Another theory traces it to a Medieval Latin darsus "a dart," which is said to be of Gaulish origin. Also used of similar or related fish. For loss of -r- before -s-, compare bass (n.1) from barse and see ass (n.2).

updated on June 24, 2018

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Definitions of dace from WordNet

dace (n.)
small European freshwater fish with a slender bluish-green body;
Synonyms: Leuciscus leuciscus
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.