a. Path. [ad. mod.L. aphthōs-us (Fr. aphtheux), f. APHTHA: see -OUS.] Of the nature of, or characterized by, aphtha.

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1757.  Whyte, in Phil. Trans., L. 572. Tongue … with a beginning aphthous crust on some parts of it.

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1830.  Lindley, Nat. Syst. Bot., 7. Aphthous affections of the mouth.

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1849–52.  Todd, Cycl. Anat., IV. 1155/1. An aphthous tongue.

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