From ring +"Ž worm, being descriptive of what it looks like.
Ringworm Sentence Examples
You can catch ringworm by touching people who are infected or by sharing things like combs or shoes.
Ringworm is a skin infection caused by fungus that can affect the scalp, skin, fingers, toenails, or feet.
Carbolic acid is an efficient parasiticide, and is largely used in destroying the fungus of ringworm and of the skin disease known as pityriasis versicolor.
Where can I swim in the Thames without getting ringworm?
About one sixth of the native population of the interior, and a smaller proportion of those living on the coast, suffer from a kind of ringworm called kurap, which also prevails almost universally among the Sakai and Semang, the aboriginal hill tribes of the Malayan Peninsula.