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canker sore

n :  a small painful ulcer esp. of the mouth : esp  :  a painful shallow ulceration of the oral mucous membranes that has a grayish-white base surrounded by a reddish inflamed area and is characteristic of aphthous stomatitis - compare COLD SORE  .
 
 

 
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Rangely District Hospital (Rangely, Colorado - Rio Blanco County)