Freebase(0.00 / 0 votes)Rate this definition: Hydroelectricity. Hydroelectricity is the term referring to electricity generated by hydropower; the production of electrical power through the use of the gravitational force of falling or flowing water.
Definition: Hormones. Hormones. Hormones are chemical substances that act like messenger molecules in the body. After being made in one part of the body, they travel to other parts of the body where they help control how cells and organs do their work. For example, insulin is a hormone that's made by the beta cells in the pancreas.
Hormones are a regulatory substance produced in an organism and  transported in tissue fluids such as blood to stimulate cells or  tissues into action. Hormones are vital fo â¦ r proper function of the  body because the substances trigger the proper function.n fact it is a part of the brain that specializes in endocrine function. Thus, the brain and the nervous system are ultimately in control of hormone release and production.