From Latin 'benignus,' a contraction of 'bene' (well) + 'genus' (birth) — the medical 'benign/malignant' literally means 'well-born/ill-born.'
Gentle and kind in disposition; not harmful; (of a tumor) not cancerous.
From Old French 'benigne,' from Latin 'benignus' meaning 'kind, generous, favorable,' a contraction of *bene-genus (well-born), from 'bene' (well) + 'genus' (birth, race, kind), from PIE *ǵenh₁- (to produce, to beget, to be born). The original sense was 'of good birth,' reflecting the aristocratic assumption that good character followed from noble lineage. This social logic — that virtue is inherited along with blood — saturates the Latin vocabulary of goodness: 'generous' itself comes from 'genus,' as does 'gentle' (of good family), 'genteel,' and 'gentry.' The PIE root *ǵenh₁- also gave Latin 'gignere' (to beget), 'natura' (nature, literally 'that which has been born'), Greek
The medical antonyms 'benign' and 'malignant' literally mean 'well-born' and 'ill-born' — as if a tumor's character, like a medieval aristocrat's, were determined by its origins. The metaphor treats cancer as a question of lineage: benign growths have 'good' origins and stay contained; malignant ones have 'bad' origins and spread destructively.
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