Definition: Anatomical: A small, slender organ that serves as a home for nutrients, oxygen, and waste products in the human body. In Greek mythology, it was associated with Zeus. Definition: The Greek term "anaerobic" means 'without oxygen,' meaning that it does not take part in aerobic metabolism (where energy is produced through cellular respiration). This word comes from ancient Greek roots, referring to a lack of oxygen. It implies the absence of fermentation or aerobic processes such as bacteria, where anaerobium serves as a source of energy and nutrients for the body. Anatomical Definition: An anabolic organ that serves as a home for nutrients (like glucose) and waste products in the human body; it is also associated with Greek mythology, where it was thought to be associated with Zeus.