Definition: The word 'arrhizous' refers to a type of fungus that thrives in wet, nutrient-poor soil environments. It's called "Arrhyza" in Hebrew, meaning "fungal growth." This fungal species can grow rapidly through its thick and dense spores. They are found on the surface of plant roots, making them difficult to identify by eye alone. The term 'arrhizous' is significant because it highlights the importance of understanding soil health for crops due to these fungi's ability to control diseases.