The Clydesdale is a draft horse breed from Lanarkshire, Scotland, and its name was inspired by the River Clyde. The Clydesdaleâs history goes back to the mid-1700s, when native stocks were mated with larger Flemish horses and then selected for use in agriculture and for all types of heavy hauling, including transport through the streets of Glasgow.
Definition. 1  A carcinogen is a substance that causes cancer (or is believed to cause cancer). 2  A carcinogenic material is one that is known to cause cancer. 3  The process of forming cancer cells from normal cells or carcinomas is called carcinogenesis. A carcinogenic material is one that is known to cause cancer. 2  The process of forming cancer cells from normal cells or carcinomas is called carcinogenesis.
Â· carcinogenesis [kar sin o jenÂ´ eh sis] The process by which normal cells are transformed into cancer cells. Â· carcinoma [kar sih noÂ´ ma] A malignant tumor that arises from skin or the lining of internal body organs, for example, the breast, prostate, lung, stomach or bowel. Carcinomas often invade adjacent tissue and spread to distant organs, including the brain.