Freebase(0.00 / 0 votes)Rate this definition: Arbol is a programming language which has been primarily developed for use in Genetic Programming experiments. It is a functional programming language inspired by the ideas of other small and esoteric languages.
Causes. In most cases of colon or rectal cancers, the cause or causes are unknown. Defects in genes that normally protect against cancer play the major role in causing polyp cells to continuously change and become cancerous.
These can increase colon cancer risk: 1  Older age, especially 60 years or older. 2  Family history of colon cancer. 3  Inflammatory bowel disease. 4  Being tall (5 feet 8 inches or taller for women; 5 feet 11 inches or taller for men)