Relating to or characteristic of actinomycosis, a chronic bacterial infection caused by Actinomyces species that typically affects the jaw, lungs, or abdomen.
From actinomyces (Greek aktin- 'ray' + mykes 'fungus') + -osis (disease condition) + -istic (adjective suffix). Though called a fungus historically, it's actually a bacterium; the name stuck from early misidentification.
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