Etymology
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ringworm (n.)

name given to certain skin diseases manifesting in circular patches, early 15c. (Chauliac), from ring (n.1) + worm (n.). Earlier it meant "an intestinal worm" (late Old English). In boxing slang, it meant "habitué of prize-fights" (by 1929).

updated on August 27, 2021

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Definitions of ringworm from WordNet

ringworm (n.)
infections of the skin or nails caused by fungi and appearing as itching circular patches;
Synonyms: tinea / roundworm
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.