Book XI covers human beings, portents and transformations. Isidore derives human beings ("homo") from the Latin for soil ("humus"), as in Genesis 2:7 it says that man is made from the soil. Urine ("urina") gets its name either from the fact that it can burn ("urere") the skin or, Isidore hedges, that it is from the kidneys ("renes"). "Femina", meaning woman, comes from "femora/femina" meaning thighs, as this part of the body shows she is not a man. The Latin for buttocks is "clunis" as they are near the large intestine or colon ("colum").