Third-person singular of 'contuse' (to bruise), or plural of 'contuse' as a noun (bruises, contusions).
From the verb 'contuse' (to bruise) plus the regular -s/-es ending for third person singular or plural nouns. Standard English morphology applied to a Latin-derived medical term.
When you see 'contuses' on a medical report, it's usually the verb form: 'the impact contuses the soft tissue.' The word appears more in formal medical writing than in everyday speech, making it sound more technical and official.
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