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.
Editors Contribution (0.00 / 0 votes) Rate this definition: halogen. Halogen (noun) involves five elements such as fluorine, chlorine, bromine, iodine and astatine. That part in a group VIIA of the periodic table. Halogen is a negative ions that react with most metals to form salts. halogen Is a group in the periodic table consisting of five chemically related elements with similar properties. Any of a group of five nonmetallic elements with similar properties.