Lesion
Etymology
From Latin “laesio” (an injury), from “laedere” (to hurt, strike, or damage). The word’s vagueness is a feature, not a flaw: it covers everything from a scrape to a tumor precisely because it names damage without naming its cause. The same root surfaces in “collision” and, distantly, in “laesa majestas” — an injury to the crown.
noun · /LEE-zhuhn/
Any area of tissue that has been damaged or abnormally changed by injury or disease.
What it names
A deliberately neutral catch-all — a spot, sore, wound, or abnormal patch — that lets doctors flag something wrong without yet committing to what it is or how serious it might be.
Example
The dermatologist photographed the lesion on his back and asked him to return in three months to see whether it had changed.
Related idea
A lesion is any patch of damaged tissue; a tumor is specifically an abnormal growth. Every tumor is a lesion, but most lesions — a bruise, an ulcer, a scar — are nothing of the kind, which is why the word buys a doctor time before judgment.