Inflammation of the vas deferens, the tube carrying sperm in males.
From deferens (vas deferens) + -itis (Greek suffix meaning inflammation, from iein 'to go'). Medical terminology systematically combines anatomical names with this standard inflammation suffix.
Medical students learn that -itis always means inflammation: appendicitis, bronchitis, meningitis. Once you crack that code, you can decode hundreds of medical terms even if you've never heard them before.
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