Relating to or characteristic of aphthae; marked by the presence of mouth ulcers or blisters.
From Greek aphtha (blister, ulcer) + -ic (adjective suffix). This converts the noun into an adjective used in medical descriptions.
Doctors use 'aphthic' to describe any mouth condition showing ulcers, but laypeople don't know this word—which is why the same condition gets called 'aphthous' in some contexts, showing how medical language constantly creates synonyms.
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