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.
(kÃ¤r'sÉ-nÅ'mÉ) Plural carcinomas or carcinomata (kÃ¤r'sÉ-nÅ'mÉ-tÉ) Any of various cancerous tumors that are derived from epithelial tissue of the skin, blood vessels, or other organs and that tend to metastasize to other parts of the body. See also basal cell carcinoma, squamous cell carcinoma.